Tuning magnetic anisotropy, Kondo screening and Dzyaloshinskii-Moriya interaction in pairs of Fe adatoms
|
|
- Aron Lindsey
- 6 years ago
- Views:
Transcription
1 Tuning magnetic anisotropy, Kondo screening and Dzyaloshinskii-Moriya interaction in pairs of Fe adatoms Department of Physics, Hamburg University, Hamburg, Germany SPICE Workshop, Mainz
2 Outline Tune magnetic properties of single Fe Hund s impurities by Hydrogenation A. A. Khajetoorians,, M. Steinbrecher et al., Nat. Nanotech., accepted (2015) Trace exchange interactions in FeH 2 -Fe pairs A. A. Khajetoorians, M. Steinbrecher et al., submitted (2015) Ho 4f adatoms as single quantum bits? M. Steinbrecher et al., Nat. Comm., submitted (2015) Outline 2
3 charge fluctuations What is a Hund s impurity? L. Huang et al., arxiv: v1; A. Georges et al., Annu. Rev. Condens. Matter Phys. 4, 137 (2013) Different energetic contributions create various electronic states five orbital Anderson model description Hund s rules: How to arrange e - in orbitals Competition: CF+SO coupling, Hund s exchange, Kondo screening Hybridization V dk : U coulomb small charge fluctuations A. A. Khajetoorians,, M. Steinbrecher et al., Nat. Nanotech., accepted (2015) Tune magnetic properties of Fe Hund s impurities 3
4 What is a Hund s impurity? L. Huang et al., arxiv: v1; A. Georges et al., Annu. Rev. Condens. Matter Phys. 4, 137 (2013) 1. Mixed valency: weak hybridization no (half-) integer spin J 5/2 2. Non-zero, well-defined magnetic moment: stabilized by intra-atomic Hund s exchange strong hybridization (U coulomb < V dk < J Hund ) Hund s impurity explains physics in TMOs, Fe pnictides, etc. Tune magnetic properties of Fe Hund s impurities 4
5 Fe adatoms on Pt(111) - Hydrogenation A. A. Khajetoorians,, M. Steinbrecher et al., Nat. Nanotech., accepted (2015) Tune magnetic properties of Fe Hund s impurities 5
6 Fe adatoms on Pt(111) - Hydrogenation Cold deposition ( 4 K) of single Fe atoms ( 1/100 ML) on Pt(111) 2 adsorption sites: Fe fcc, Fe hcp A. A. Khajetoorians et al., Phys. Rev. Lett. 111, (2013) Hydrogenation (2 species per site): Fe fcc H, Fe hcp H, Fe fcc H 2, Fe hcp H 2 fcc Fe (100 pm) FeH (170 pm) Tip induced 500 mv pulse similar: F. D. Natterer et al., Surf. Sci. 615, (2013) F. Donati et al., Phys. Rev. Lett. 111, (2013) D. Serrate et al., J. Phys. Chem. C 118, 5827 (2014) Q. Dubout et al., Phys. Rev. Lett. 114, (2015) 5 nm hcp Tune magnetic properties of Fe Hund s impurities FeH 2 (100 (180 pm) pm, 1%) Remove H x with STM tip V = -100mV, I = 1nA A. A. Khajetoorians,, M. Steinbrecher et al., Nat. Nanotech., accepted (2015) 6
7 Ab initio calculation: Fe magnetic moments fully relativistic KKR, including 62 Pt atoms, spin and orbital momenta (S. Lounis et al., FZ Jülich) A. A. Khajetoorians et al., Phys. Rev. Lett. 111, (2013) fcc hcp m S (in µ B ) m L (in µ B ) m tot (in µ B ) J = m total gµ B 5 2 H = g J μ B B J + DJ z 2 approximate value used for effective spin hamiltonian crystal field theory for C 3v symmetry e.g.: T. Schuh et al., PRB 84, (2011) FeH n -complexes: (A. Lichtenstein et al.) magnetic moment nearly unchanged Tune magnetic properties of Fe Hund s impurities 7
8 Quantum Monte Carlo calculations Using ab inition calculated hybridization functions (A. Lichtenstein et al., Uni HH) l 1. Metallic behaviour of 3d occupancy 2. Finite scattering rate at lowest Matsubara frequency nonzero magn. moment clean Fe Fe-H, Fe-H 2 all 6 complexes are Hund s impurities! A. A. Khajetoorians,, M. Steinbrecher et al., Nat. Nanotech., accepted (2015) Tune magnetic properties of Fe Hund s impurities 8
9 Effect of Hydrogenation Perform Inelastic Scanning Tunneling Spectroscopy 0.3 K Hydrogen affects magnetic properties Q. Dubout et al., Phys. Rev. Lett. 114, (2015) Kondo state for Fe hcp H 2 fcc hcp FeH 2 FeH Fe 0.75 mev 0.19 mev A. A. Khajetoorians,, M. Steinbrecher et al., Nat. Nanotech., accepted (2015) Tune magnetic properties of Fe Hund s impurities 9
10 Anisotropy D more negative stronger easy axis Effect of Hydrogenation - fcc fcc: easy axis out-of-plane J z = ± 5/2 ground state A. A. Khajetoorians,, M. Steinbrecher et al., Nat. Nanotech., accepted (2015) Tune magnetic properties of Fe Hund s impurities 10
11 Anisotropy D decreases Effect of Hydrogenation - hcp hcp: easy-plane J z = ± 1/2 ground state A. A. Khajetoorians,, M. Steinbrecher et al., Nat. Nanotech., accepted (2015) Tune magnetic properties of Fe Hund s impurities 11
12 Multi-orbital Kondo effect Temperature & B dependent measurements characterize Kondo Wilson s definition of T K : H. Prüser et al., Nature Physics 7, 1745 (2011) T K = 0.27Γ k B 2.8 K (T exp = 0.3 K) k B T K 230 µev > Δ µev Δ: Peak splitting spin ½ Various deviations from spin ½ Kondo theories multi orbital Kondo effect Test system to develop advanced theories Use sensitive Kondo resonance as a sensor! A. A. Khajetoorians,, M. Steinbrecher et al., Nat. Nanotech., accepted (2015) Tune magnetic properties of Fe Hund s impurities 12
13 Tune magnetic properties of single Fe Hund s impurities by Hydrogenation A. A. Khajetoorians,, M. Steinbrecher et al., Nat. Nanotech., accepted (2015) Trace exchange interactions in FeH 2 -Fe pairs A. A. Khajetoorians, M. Steinbrecher et al., submitted (2015) Use the very sensitive Kondo resonance as a sensor! Ho 4f adatoms as single quantum bits? M. Steinbrecher et al., Nat. Comm., submitted (2015) Outline 13
14 0 height (pm) 220 Effect of magnetic coupling to spectral signature Place an Fe atom next to a Kondo impurity Kondo peak shows splitting Excitation shows shift Offset: artificial Fe hcp H 2 Fe hcp 8.31 Å 1 nm Splitting 500 µev V stab = 6 mv // I stab = 3 na // V mod = 40 µa Trace exchange interactions in FeH2-Fe pairs 14
15 Distance dependent Kondo splitting V stab = 6 mv // I stab = 3 na // V mod = 40 µa Trace exchange interactions in FeH2-Fe pairs 15
16 Substrate mediated contributions to Kondo splitting Simulate experimental results (in B-field) with local spin Hamiltonian H = H Zeeman + H Ani + H J + H D = g 1 μ B B S 1 + g 2 μ B B S 2 + K 1 S 2 2 1,z + K 2 S 2,z JS 1 S 2 + D (S 1 S 2 ) 1. Anisotropy (lowest order, K) 2. Isotropic exchange coupling (J) 3. Dzyaloshinskii Moriya interaction (D) only D important! Figure inspired by: A. Fert, V. Cros and J. Sampaio, Nat. Nanotechn. 8, 152 (2013) Use 3rd order perturbation theory to model coupling to substrate/tip e- including anisotropy and RKKY exchange terms (M. Ternes) M. Ternes, New J. of Phys., 17, (2015) Approximation: use g 1, g 2, K 1, K 2 from fitting spectra of uncoupled Fe hcp H 2 /Fe hcp change J and D to fit pair spectra Trace exchange interactions in FeH2-Fe pairs 16
17 Model experimental data, d = 8.31 Å D = 0.0 mev Dzyaloshinskii-Moria interaction needed for description ± 5/2, ± 3/2, ± 1/2 Trace exchange interactions in FeH2-Fe pairs 17
18 normalized Distance dependency of J and DMI ISTS experiments in B-field + simulations in model ab-initio calculation using KKR Greens function approach by M. Bouhassoune, S. Lounis (hcp-hcp pairs only) D = D 2 + D 2 + D z 2 D plane = D 2 + D 2 Trace exchange interactions in FeH2-Fe pairs 18
19 Distance dependent chirality positive chirality D z not always negligible sign(d ) changes chirality (sense of rotation) D z negative chirality D Fehcp Fe hcp H 2 D Spin expectation values show different rotation of spins chirality Trace exchange interactions in FeH2-Fe pairs 19
20 Tune magnetic properties of single Fe Hund s impurities by Hydrogenation A. A. Khajetoorians,, M. Steinbrecher et al., Nat. Nanotech., accepted (2015) Trace exchange interactions in FeH 2 -Fe pairs A. A. Khajetoorians, M. Steinbrecher et al., submitted (2015) Ho 4f adatoms as single quantum bits? M. Steinbrecher et al., Nat. Comm., submitted (2015) Outline 20
21 Localized 4f orbital decouples spin? Ultimate goal: Single spins for data storage and processing devices! Use rare earth atoms with strongly localized 4f states A. J. Freeman and R. E. Watson, Phys. Rev. 127, 2058 (1965) A. A. Khajetoorians, et al., Science 339, 552 (2013) Ho/Pt(111), STM stable magn. state of single atom Ho/Pt(111), XMCD magnetic, different ground state T. Miyamachi et al., Nature 503, 242 (2013) F. Donati et al., PRL 113, (2014) Ho 4f adatoms as single quantum bits? 21
22 Spin-excitation: expectations 2 different magnetic ground states reported: T. Miyamachi et al.: J z = 8 DFT F. Donati et al.: J z = 6 XMCD + Multiplet calculations Spin-excitations: - fcc: 8 mev - hcp: 5 mev Zero-Field Splitting 3.9 mev Symmetry protection of ground state T. Miyamachi et al., Nature 503, (2013) F. Donati et al., PRL 113, (2014) Ho 4f adatoms as single quantum bits? 22
23 ISTS of Fe and Ho ISTS on arranged Ho & Fe atoms with the same tip Fe system well known Ho fcc Fe fcc Fe hcp step energy 0.75 mev 0.19 mev step intensity 8 % 12 % Fe hcp Fe fcc Ho hcp A. A. Khajetoorians et al., PRL 111, (2013) I stab = 5 na // V stab = 10 mv // V mod = 40 µv // f mod = khz Does it interact magnetically? Ho 4f adatoms as single quantum bits? 23
24 RKKY coupled pairs of Ho & Fe atoms Manipulate pairs of Ho & Fe atoms with various distances 4.24 Å 5.55 Å 13.9 Å Ho only affects Fe in direct exchange regime Only excitation intensity is changed, not its energy Ho 4f adatoms as single quantum bits? 24
25 SP-STM measurements Try to find switching of magnetic ground state on Ho atoms Build Fe 3 -cluster as a reference Get spin-polarized tip Fe 5 /Cu(111): A. A. Khajetoorians et al., Science 339, 55 (2013) U = 5 mv, I = 1 na, B = 0.2 T Fe pm Ho 1 nm 180 pm 1 nm C. Hübner et al., PR B 90, (2014) No magnetization switching observed on Ho atom (with various parameters) paramagentic behaviour, or too weak spin-polarization Ho 4f adatoms as single quantum bits? 25
26 Summary Fe atoms on Pt(111) are Hund s impurities H-doping changes anisotropy and leads to complex multi-orbital Kondo effect Heisenberg and Dzyaloshinskii-Moriya interactions tuned in FeH 2 -Fe pairs DMI induces non-collinear ground states (chirality) and drives a system faster into classical behaviour Single Ho atoms show no magnetic signs in STM No single atom quantum bit! Summary 26
27 Acknowledgements Experiments: Uni Hamburg (*former group member) Model: MPI Stuttgart Dr. A. Sonntag Jan Hermenau Dr. T. Schlenk* Prof. A. A. Khajetoorians* Dr. J. Wiebe Prof. R. Wiesendanger Dr. M. Ternes Theory: Uni Hamburg Uni Bremen FZ Jülich M. Valentyuk Prof. Dr. A. I. Lichtenstein Prof. Dr. T. O. Wehling Dr. M. Bouhassoune Dr. M. dos Santos Dias Dr. S. Lounis Acknowledgements 27
Manipulation of interface-induced Skyrmions studied with STM
Manipulation of interface-induced Skyrmions studied with STM Kirsten von Bergmann S. Heinze, M. Bode, P. Ferriani, E.Y. Vedmedenko, A. Kubetzka, O. Pietzsch and R. Wiesendanger Institute of Applied Physics,,
More informationTuning emergent magnetism in a Hund s impurity
SUPPLEMENTARY INFORMATION DOI:.8/NNANO.5.9 Tuning emergent magnetism in a Hund s impurity A. A. Khajetoorians, M. Valentyuk, M. Steinbrecher, T. Schlenk, A. Shick, J. Kolorenc, A. I. Lichtenstein, T. O.
More informationSkyrmions à la carte
This project has received funding from the European Union's Horizon 2020 research and innovation programme FET under grant agreement No 665095 Bertrand Dupé Institute of Theoretical Physics and Astrophysics,
More informationSkyrmion à la carte. Bertrand Dupé. Skyrmion à la carte Bertrand Dupé. Institute of Physics, Johannes Gutenberg University of Mainz, Germany
Skyrmion à la carte Bertrand Dupé Institute of Physics, Johannes Gutenberg University of Mainz, Germany 1 Acknowledgement Charles Paillard Markus Hoffmann Stephan von Malottki Stefan Heinze Sebastian Meyer
More informationEFFECTIVE MAGNETIC HAMILTONIANS: ab initio determination
ICSM212, Istanbul, May 3, 212, Theoretical Magnetism I, 17:2 p. 1 EFFECTIVE MAGNETIC HAMILTONIANS: ab initio determination Václav Drchal Institute of Physics ASCR, Praha, Czech Republic in collaboration
More informationMicroscopical and Microanalytical Methods (NANO3)
Microscopical and Microanalytical Methods (NANO3) 06.11.15 10:15-12:00 Introduction - SPM methods 13.11.15 10:15-12:00 STM 20.11.15 10:15-12:00 STS Erik Zupanič erik.zupanic@ijs.si stm.ijs.si 27.11.15
More informationSupplementary Figures
Supplementary Figures Supplementary Figure 1: Region mapping. a Pristine and b Mn-doped Bi 2 Te 3. Arrows point at characteristic defects present on the pristine surface which have been used as markers
More informationTemperature-dependence of magnetism of free Fe clusters
Temperature-dependence of magnetism of free Fe clusters O. Šipr 1, S. Bornemann 2, J. Minár 2, S. Polesya 2, H. Ebert 2 1 Institute of Physics, Academy of Sciences CR, Prague, Czech Republic 2 Universität
More informationElectron transport through Shiba states induced by magnetic adsorbates on a superconductor
Electron transport through Shiba states induced by magnetic adsorbates on a superconductor Michael Ruby, Nino Hatter, Benjamin Heinrich Falko Pientka, Yang Peng, Felix von Oppen, Nacho Pascual, Katharina
More informationMany-body correlations in a Cu-phthalocyanine STM single molecule junction
Many-body correlations in a Cu-phthalocyanine STM single molecule junction Andrea Donarini Institute of Theoretical Physics, University of Regensburg (Germany) Organic ligand Metal center Non-equilibrium
More informationSUPPLEMENTARY INFORMATION
SUPPLEMENTARY INFORMATION DOI:.38/NPHYS2299 Atom-by-atom engineering and magnetometry of tailored nanomagnets Wiebe_supplementary.pdf: The supplementary contains details of the experimental methods and
More informationMagnetic anisotropy in frustrated clusters and monolayers: Cr on triangular Au(111) surface
Magnetic anisotropy in frustrated clusters and monolayers: Cr on triangular Au(111) surface László Balogh Krisztián Palotás László Udvardi László Szunyogh Department of Theoretical Physics Budapest University
More informationSpin and Orbital Magnetism of Rare Earth Atoms Adsorbed on Graphene and Metal Substrates
Spin and Orbital Magnetism of Rare Earth Atoms Adsorbed on Graphene and Metal Substrates Alexander Shick Institute of Physics ASCR, Prague, CZ ü Acknowledge collaboration with D. Shapiro, Inst. of Electronics,
More informationX-ray Magnetic Circular and Linear Dichroism (XMCD, XMLD) and X-ray Magnetic Imaging (PEEM,...)
X-ray Magnetic Circular and Linear Dichroism (XMCD, XMLD) and X-ray Magnetic Imaging (PEEM,...) Jan Vogel Institut Néel (CNRS, UJF), Nanoscience Department Grenoble, France - X-ray (Magnetic) Circular
More informationEngineering the spin couplings in atomically crafted spin chains on an elemental superconductor
Engineering the spin couplings in atomically crafted spin chains on an elemental superconductor Kamlapure et al, 1 Supplementary Figures Supplementary Figure 1 Spectroscopy on different chains. a, The
More informationElectronic, magnetic and spectroscopic properties of free Fe clusters
Electronic, magnetic and spectroscopic properties of free Fe clusters O. Šipr 1, M. Košuth 2, J. Minár 2, S. Polesya 2 and H. Ebert 2 1 Institute of Physics, Academy of Sciences of the Czech Republic,
More informationtunneling theory of few interacting atoms in a trap
tunneling theory of few interacting atoms in a trap Massimo Rontani CNR-NANO Research Center S3, Modena, Italy www.nano.cnr.it Pino D Amico, Andrea Secchi, Elisa Molinari G. Maruccio, M. Janson, C. Meyer,
More informationSpin electric coupling and coherent quantum control of molecular nanomagnets
Spin electric coupling and coherent quantum control of molecular nanomagnets Dimitrije Stepanenko Department of Physics University of Basel Institute of Physics, Belgrade February 15. 2010 Collaborators:
More informationTheory of magnetic interactions in real materials. Mikhail Katsnelson
Theory of magnetic interactions in real materials Mikhail Katsnelson Outline 1. Introduction 2. Exchange interactions from first principles 3. Beyond DFT: correlated systems and LDA+DMFT 4. Applications:
More informationSUPPLEMENTARY INFORMATION
doi:10.1038/nature12759 FORBIDDEN TRANSITIONS IN HO ON PT(111) For a single Ho atom on a Pt(111) surface, the adsorption site s symmetry is given by C 3v. To describe the effect of the crystal field on
More informationAnisotropic Magnetic Structures in Iron-Based Superconductors
Anisotropic Magnetic Structures in Iron-Based Superconductors Chi-Cheng Lee, Weiguo Yin & Wei Ku CM-Theory, CMPMSD, Brookhaven National Lab Department of Physics, SUNY Stony Brook Another example of SC
More informationLecture 2: Magnetic Anisotropy Energy (MAE)
Lecture : Magnetic Anisotropy Energy (MAE) 1. Magnetic anisotropy energy = f(t). Anisotropic magnetic moment f(t) [111] T=3 K Characteristic energies of metallic ferromagnets M (G) 5 3 [1] 1 binding energy
More informationPG5295 Muitos Corpos 1 Electronic Transport in Quantum dots 2 Kondo effect: Intro/theory. 3 Kondo effect in nanostructures
PG5295 Muitos Corpos 1 Electronic Transport in Quantum dots 2 Kondo effect: Intro/theory. 3 Kondo effect in nanostructures Prof. Luis Gregório Dias DFMT PG5295 Muitos Corpos 1 Electronic Transport in Quantum
More informationImpurities and graphene hybrid structures: insights from first-principles theory
Impurities and graphene hybrid structures: insights from first-principles theory Tim Wehling Institute for Theoretical Physics and Bremen Center for Computational Materials Science University of Bremen
More informationFinite-temperature magnetism of ultrathin lms and nanoclusters PhD Thesis Booklet. Levente Rózsa Supervisor: László Udvardi
Finite-temperature magnetism of ultrathin lms and nanoclusters PhD Thesis Booklet Levente Rózsa Supervisor: László Udvardi BME 2016 Background of the research Magnetic materials continue to play an ever
More informationDon Eigler IBM Fellow. Spin Excitation Spectroscopy : A Tool Set For Nano-Scale Spin Systems
Don Eigler IBM Fellow Spin Excitation Spectroscopy : A Tool Set For Nano-Scale Spin Systems NSF Grantees Conference, Arlington, VA. December 6, 2010 A Challenge Build a Spin-Only Nano-Scale Digital Computer
More informationMean-field theory. Alessandro Vindigni. ETH October 29, Laboratorium für Festkörperphysik, ETH Zürich
Alessandro Vindigni Laboratorium für Festkörperphysik, ETH Zürich ETH October 29, 2012 Lecture plan N-body problem Lecture plan 1. Atomic magnetism (Pescia) 2. Magnetism in solids (Pescia) 3. Magnetic
More informationLuigi Paolasini
Luigi Paolasini paolasini@esrf.fr LECTURE 4: MAGNETIC INTERACTIONS - Dipole vs exchange magnetic interactions. - Direct and indirect exchange interactions. - Anisotropic exchange interactions. - Interplay
More informationFirst principle calculations of plutonium and plutonium compounds: part 1
First principle calculations of plutonium and plutonium compounds: part 1 A. B. Shick Institute of Physics ASCR, Prague, CZ Outline: u Lecture 1: Methods of Correlated band theory DFT and DFT+U u Lecture
More informationMagnetism in low dimensions from first principles. Atomic magnetism. Gustav Bihlmayer. Gustav Bihlmayer
IFF 10 p. 1 Magnetism in low dimensions from first principles Atomic magnetism Gustav Bihlmayer Institut für Festkörperforschung, Quantum Theory of Materials Gustav Bihlmayer Institut für Festkörperforschung
More informationSpins and spin-orbit coupling in semiconductors, metals, and nanostructures
B. Halperin Spin lecture 1 Spins and spin-orbit coupling in semiconductors, metals, and nanostructures Behavior of non-equilibrium spin populations. Spin relaxation and spin transport. How does one produce
More informationMPI Stuttgart. Atomic-scale control of graphene magnetism using hydrogen atoms. HiMagGraphene.
MPI Stuttgart Atomic-scale control of graphene magnetism using hydrogen atoms HiMagGraphene ivan.brihuega@uam.es www.ivanbrihuega.com Budapest, April, 2016 Magnetism in graphene: just remove a p z orbital
More informationElectron transport simulations from first principles
Electron transport simulations from first principles Krisztián Palotás Budapest University of Technology and Economics Department of Theoretical Physics Budapest, Hungary Methods Tunneling & ballistic
More informationJ 12 J 23 J 34. Driving forces in the nano-magnetism world. Intra-atomic exchange, electron correlation effects: Inter-atomic exchange: MAGNETIC ORDER
Driving forces in the nano-magnetism world Intra-atomic exchange, electron correlation effects: LOCAL (ATOMIC) MAGNETIC MOMENTS m d or f electrons Inter-atomic exchange: MAGNETIC ORDER H exc J S S i j
More informationOutline. Introduction: graphene. Adsorption on graphene: - Chemisorption - Physisorption. Summary
Outline Introduction: graphene Adsorption on graphene: - Chemisorption - Physisorption Summary 1 Electronic band structure: Electronic properties K Γ M v F = 10 6 ms -1 = c/300 massless Dirac particles!
More informationSTM spectroscopy (STS)
STM spectroscopy (STS) di dv 4 e ( E ev, r) ( E ) M S F T F Basic concepts of STS. With the feedback circuit open the variation of the tunneling current due to the application of a small oscillating voltage
More informationSTM spectra of graphene
STM spectra of graphene K. Sengupta Theoretical Physics Division, IACS, Kolkata. Collaborators G. Baskaran, I.M.Sc Chennai, K. Saha, IACS Kolkata I. Paul, Grenoble France H. Manoharan, Stanford USA Refs:
More informationKondo Effect in Nanostructures
Kondo Effect in Nanostructures Argonne National Laboratory May 7th 7 Enrico Rossi University of Illinois at Chicago Collaborators: Dirk K. Morr Argonne National Laboratory, May 7 The Kondo-effect R Metal
More informationResonant Inelastic X-ray Scattering on elementary excitations
Resonant Inelastic X-ray Scattering on elementary excitations Jeroen van den Brink Ament, van Veenendaal, Devereaux, Hill & JvdB Rev. Mod. Phys. 83, 705 (2011) Autumn School in Correlated Electrons Jülich
More information2) Atom manipulation. Xe / Ni(110) Model: Experiment:
2) Atom manipulation D. Eigler & E. Schweizer, Nature 344, 524 (1990) Xe / Ni(110) Model: Experiment: G.Meyer, et al. Applied Physics A 68, 125 (1999) First the tip is approached close to the adsorbate
More informationSpatially resolving density-dependent screening around a single charged atom in graphene
Supplementary Information for Spatially resolving density-dependent screening around a single charged atom in graphene Dillon Wong, Fabiano Corsetti, Yang Wang, Victor W. Brar, Hsin-Zon Tsai, Qiong Wu,
More informationMagnetism. Eric Bousquet. University of Liège. Abinit School, Lyon, France 16/05/2014
Magnetism University of Liège eric.bousquet@ulg.ac.be Abinit School, Lyon, France 16/05/2014 Outline Origin of magnetism: Inside an atom Between 2 atoms Interaction with ligands Interaction through ligands
More informationElectronic structure of correlated electron systems. G.A.Sawatzky UBC Lecture
Electronic structure of correlated electron systems G.A.Sawatzky UBC Lecture 6 011 Influence of polarizability on the crystal structure Ionic compounds are often cubic to maximize the Madelung energy i.e.
More informationKondo effect in multi-level and multi-valley quantum dots. Mikio Eto Faculty of Science and Technology, Keio University, Japan
Kondo effect in multi-level and multi-valley quantum dots Mikio Eto Faculty of Science and Technology, Keio University, Japan Outline 1. Introduction: next three slides for quantum dots 2. Kondo effect
More informationElectron Correlation
Series in Modern Condensed Matter Physics Vol. 5 Lecture Notes an Electron Correlation and Magnetism Patrik Fazekas Research Institute for Solid State Physics & Optics, Budapest lb World Scientific h Singapore
More informationMicroscopy and Spectroscopy with Tunneling Electrons STM. Sfb Kolloquium 23rd October 2007
Microscopy and Spectroscopy with Tunneling Electrons STM Sfb Kolloquium 23rd October 2007 The Tunnel effect T ( E) exp( S Φ E ) Barrier width s Barrier heigth Development: The Inventors 1981 Development:
More informationSingle Atom Magnets? 1. Magnetic Anisotropy 2. Magnetism of individual Co Adatoms 3. Single Atom Magnets? 4. Single Molecule Magnets at Surfaces
Single Atom Magnets? 1. Magnetic Anisotropy 2. Magnetism of individual Co Adatoms 3. Single Atom Magnets? 4. Single Molecule Magnets at Surfaces Basic properties of a permanent magnet Magnetization "the
More informationSuperconductivity and spin excitations in orbitally ordered FeSe
Superconductivity and spin excitations in orbitally ordered FeSe Andreas Kreisel, Brian M. Andersen Niels Bohr Institute, University of Copenhagen, 2100 København, Denmark Peter J. Hirschfeld Department
More informationLectures on magnetism at the Fudan University, Shanghai October 2005
Lectures on magnetism at the Fudan University, Shanghai 10. 26. October 2005 Klaus Baberschke Institut für Experimentalphysik Freie Universität Berlin Arnimallee 14 D-14195 D Berlin-Dahlem Germany 1 Introduction
More informationMagnetic Anisotropy. Chapter Introduction
Chapter 3 Magnetic Anisotropy The work presented in this chapter was published as Large Magnetic Anisotropy of a Single Atomic Spin Embedded in a Surface Molecular Network, by C. F. Hirjibehedin, C.-Y.
More informationCompeting Ferroic Orders The magnetoelectric effect
Competing Ferroic Orders The magnetoelectric effect Cornell University I would found an institution where any person can find instruction in any study. Ezra Cornell, 1868 Craig J. Fennie School of Applied
More informationOrbital order and Hund's rule frustration in Kondo lattices
Orbital order and Hund's rule frustration in Kondo lattices Ilya Vekhter Louisiana State University, USA 4/29/2015 TAMU work done with Leonid Isaev, LSU Kazushi Aoyama, Kyoto Indranil Paul, CNRS Phys.
More informationStability of skyrmion lattices and symmetries of Dzyaloshinskii-Moriya magnets. Alexey A. Kovalev Utkan Güngördü Rabindra Nepal
Stability of skyrmion lattices and symmetries of Dzyaloshinskii-Moriya magnets Alexey A. Kovalev Utkan Güngördü Rabindra Nepal Outline Discuss possible 2D Dzyaloshinskii-Moriya magnets Study phase diagram
More informationSupplementary Figure 1 Representative sample of DW spin textures in a
Supplementary Figure 1 Representative sample of DW spin textures in a Fe/Ni/W(110) film. (a) to (d) Compound SPLEEM images of the Fe/Ni/W(110) sample. As in Fig. 2 in the main text, Fe thickness is 1.5
More informationSelf-Assembly of Two-Dimensional Organic Networks Containing Heavy Metals (Pb, Bi) and Preparation of Spin-Polarized Scanning Tunneling Microscope
MPhil Thesis Defense Self-Assembly of Two-Dimensional Organic Networks Containing Heavy Metals (Pb, Bi) and Preparation of Spin-Polarized Scanning Tunneling Microscope Presented by CHEN Cheng 12 th Aug.
More informationSuperconductivity in Heavy Fermion Systems: Present Understanding and Recent Surprises. Gertrud Zwicknagl
Magnetism, Bad Metals and Superconductivity: Iron Pnictides and Beyond September 11, 2014 Superconductivity in Heavy Fermion Systems: Present Understanding and Recent Surprises Gertrud Zwicknagl Institut
More informationMolecular and carbon based electronic systems
Molecular and carbon based electronic systems Single molecule deposition and properties on surfaces Bottom Up Top Down Fundamental Knowledge & Functional Devices Thilo Glatzel, thilo.glatzel@unibas.ch
More informationSpin or Orbital-based Physics in the Fe-based Superconductors? W. Lv, W. Lee, F. Kruger, Z. Leong, J. Tranquada. Thanks to: DOE (EFRC)+BNL
Spin or Orbital-based Physics in the Fe-based Superconductors? W. Lv, W. Lee, F. Kruger, Z. Leong, J. Tranquada Thanks to: DOE (EFRC)+BNL Spin or Orbital-based Physics in the Fe-based Superconductors?
More informationZero-point spin-fluctuations of single adatoms
Zero-point spin-fluctuations of single adatoms arxiv:1706.02079v1 [cond-mat.mes-hall] 7 Jun 2017 Julen Ibañez-Azpiroz, Manuel dos Santos Dias, Stefan Blügel, and Samir Lounis Peter Grünberg Institute and
More informationThe electronic structure of materials 1
Quantum mechanics 2 - Lecture 9 December 18, 2013 1 An overview 2 Literature Contents 1 An overview 2 Literature Electronic ground state Ground state cohesive energy equilibrium crystal structure phase
More informationSite- and orbital-dependent charge donation and spin manipulation in electron-doped metal phthalocyanines
Site- and orbital-dependent charge donation and spin manipulation in electron-doped metal phthalocyanines Cornelius Krull 1, Roberto Robles 2, Aitor Mugarza 1, Pietro Gambardella 1,3 1 Catalan Institute
More informationMn in GaAs: from a single impurity to ferromagnetic layers
Mn in GaAs: from a single impurity to ferromagnetic layers Paul Koenraad Department of Applied Physics Eindhoven University of Technology Materials D e v i c e s S y s t e m s COBRA Inter-University Research
More informationMany-body correlations in STM single molecule junctions
Many-body correlations in STM single molecule junctions Andrea Donarini Institute of Theoretical Physics, University of Regensburg, Germany TMSpin Donostia Many-body correlations in STM single molecule
More informationDetermination of the tunnel rates through a few-electron quantum dot
Determination of the tunnel rates through a few-electron quantum dot R. Hanson 1,I.T.Vink 1, D.P. DiVincenzo 2, L.M.K. Vandersypen 1, J.M. Elzerman 1, L.H. Willems van Beveren 1 and L.P. Kouwenhoven 1
More informationComputational strongly correlated materials R. Torsten Clay Physics & Astronomy
Computational strongly correlated materials R. Torsten Clay Physics & Astronomy Current/recent students Saurabh Dayal (current PhD student) Wasanthi De Silva (new grad student 212) Jeong-Pil Song (finished
More informationSupplementary Information. Spin coupling and relaxation inside molecule-metal contacts
Supplementary Information Spin coupling and relaxation inside molecule-metal contacts Aitor Mugarza 1,2*, Cornelius Krull 1,2, Roberto Robles 2, Sebastian Stepanow 1,2, Gustavo Ceballos 1,2, Pietro Gambardella
More informationQuantum dynamics in many body systems
Quantum dynamics in many body systems Eugene Demler Harvard University Collaborators: David Benjamin (Harvard), Israel Klich (U. Virginia), D. Abanin (Perimeter), K. Agarwal (Harvard), E. Dalla Torre (Harvard)
More information/21. Tsuneya Yoshida. Collaborators: Robert Peters, Satoshi Fujimoto, and N. Kawakami 2013/6/07 (EQPCM) 1. Kyoto Univ.
2013/6/07 (EQPCM) 1 /21 Tsuneya Yoshida Kyoto Univ. Collaborators: Robert Peters, Satoshi Fujimoto, and N. Kawakami T.Y., Satoshi Fujimoto, and Norio Kawakami Phys. Rev. B 85, 125113 (2012) Outline 2 /21
More informationDEFECTS IN 2D MATERIALS: HOW WE TAUGHT ELECTRONIC SCREENING TO MACHINES
DEFECTS IN 2D MATERIALS: HOW WE TAUGHT ELECTRONIC SCREENING TO MACHINES Johannes Lischner Imperial College London LISCHNER GROUP AT IMPERIAL COLLEGE LONDON Theory and simulation of materials: focus on
More informationInterference: from quantum mechanics to nanotechnology
Interference: from quantum mechanics to nanotechnology Andrea Donarini L. de Broglie P. M. A. Dirac A photon interferes only with itself Double slit experiment: (London, 1801) T. Young Phil. Trans. R.
More informationSpectroscopies for Unoccupied States = Electrons
Spectroscopies for Unoccupied States = Electrons Photoemission 1 Hole Inverse Photoemission 1 Electron Tunneling Spectroscopy 1 Electron/Hole Emission 1 Hole Absorption Will be discussed with core levels
More informationTheory of carbon-based magnetism
Theory of carbon-based magnetism Mikhail Katsnelson Theory of Condensed Matter Institute for Molecules and Materials RU Outline sp magnetism in general: why it is interesting? Defect-induced magnetism
More informationProtection of excited spin states by a superconducting energy gap
Protection of excited spin states by a superconducting energy gap B. W. Heinrich, 1 L. Braun, 1, J. I. Pascual, 1, 2, 3 and K. J. Franke 1 1 Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee
More informationReading and Writing Single-Atom Magnets
Reading and Writing Single-Atom Magnets Fabian D. Natterer 1, 2,*, Kai Yang 1, 3, William Paul 1, Philip Willke 1, 4, Taeyoung Choi 1, Thomas Greber 1, 5, Andreas J. Heinrich 1, and Christopher P. Lutz
More informationBand calculations: Theory and Applications
Band calculations: Theory and Applications Lecture 2: Different approximations for the exchange-correlation correlation functional in DFT Local density approximation () Generalized gradient approximation
More informationSymmetry breaking in spin spirals and skyrmions by in-plane and canted magnetic fields
Symmetry breaking in spin spirals and skyrmions by in-plane and canted magnetic fields L. Schmidt, J. Hagemeister, P.-J. Hsu, A. Kubetzka, K. von Bergmann and R. Wiesendanger Department of Physics, University
More informationIntermediate valence in Yb Intermetallic compounds
Intermediate valence in Yb Intermetallic compounds Jon Lawrence University of California, Irvine This talk concerns rare earth intermediate valence (IV) metals, with a primary focus on certain Yb-based
More informationX-ray absorption spectroscopy.
X-ray absorption spectroscopy www.anorg.chem.uu.nl/people/staff/frankdegroot/ X-ray absorption spectroscopy www.anorg.chem.uu.nl/people/staff/frankdegroot/ Frank de Groot PhD: solid state chemistry U Nijmegen
More informationEnergy Spectroscopy. Ex.: Fe/MgO
Energy Spectroscopy Spectroscopy gives access to the electronic properties (and thus chemistry, magnetism,..) of the investigated system with thickness dependence Ex.: Fe/MgO Fe O Mg Control of the oxidation
More informationMETAL/CARBON-NANOTUBE INTERFACE EFFECT ON ELECTRONIC TRANSPORT
METAL/CARBON-NANOTUBE INTERFACE EFFECT ON ELECTRONIC TRANSPORT S. Krompiewski Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland OUTLINE 1. Introductory
More informationElectrical Control of Single Spins in Semiconductor Quantum Dots Jason Petta Physics Department, Princeton University
Electrical Control of Single Spins in Semiconductor Quantum Dots Jason Petta Physics Department, Princeton University g Q 2 m T + S Mirror U 3 U 1 U 2 U 3 Mirror Detector See Hanson et al., Rev. Mod. Phys.
More informationSupplementary Information
Supplementary Information I. Sample details In the set of experiments described in the main body, we study an InAs/GaAs QDM in which the QDs are separated by 3 nm of GaAs, 3 nm of Al 0.3 Ga 0.7 As, and
More informationFile name: Supplementary Information Description: Supplementary Notes, Supplementary Figures and Supplementary References
File name: Supplementary Information Description: Supplementary Notes, Supplementary Figures and Supplementary References File name: Peer Review File Description: Supplementary Note 1. CALCULATION OF THE
More informationSpin Orbit Coupling (SOC) in Graphene
Spin Orbit Coupling (SOC) in Graphene MMM, Mirko Rehmann, 12.10.2015 Motivation Weak intrinsic SOC in graphene: [84]: Phys. Rev. B 80, 235431 (2009) [85]: Phys. Rev. B 82, 125424 (2010) [86]: Phys. Rev.
More informationSfb 658 Colloquium 11 May Part II. Introduction to Two-Photon-Photoemission (2PPE) Spectroscopy. Martin Wolf
Sfb 658 Colloquium 11 May 2006 Part II Introduction to Two-Photon-Photoemission (2PPE) Spectroscopy Martin Wolf Motivation: Electron transfer across interfaces key step for interfacial and surface dynamics
More informationModeling cold collisions Atoms Molecules
Modeling cold collisions Atoms Molecules E. Tiemann, H. Knöckel, A. Pashov* Institute of Quantum Optics *University Sofia, Bulgaria collisional wave function for E 0 A R=0 hk r B adopted from J. Weiner
More informationX-Ray Magnetic Circular Dichroism: basic concepts and applications for 3d transition metals. Stefania PIZZINI Laboratoire Louis Néel CNRS- Grenoble
X-Ray Magnetic Circular Dichroism: basic concepts and applications for 3d transition metals Stefania PIZZINI Laboratoire Louis Néel CNRS- Grenoble I) - Basic concepts of XAS and XMCD - XMCD at L 2,3 edges
More informationQuantum Impurities In and Out of Equilibrium. Natan Andrei
Quantum Impurities In and Out of Equilibrium Natan Andrei HRI 1- Feb 2008 Quantum Impurity Quantum Impurity - a system with a few degrees of freedom interacting with a large (macroscopic) system. Often
More informationMagnetic recording technology
Magnetic recording technology The grain (particle) can be described as a single macrospin μ = Σ i μ i 1 0 1 0 1 W~500nm 1 bit = 300 grains All spins in the grain are ferromagnetically aligned B~50nm Exchange
More informationFrom single magnetic adatoms to coupled chains on a superconductor
From single magnetic adatoms to coupled chains on a superconductor Michael Ruby, Benjamin Heinrich, Yang Peng, Falko Pientka, Felix von Oppen, Katharina Franke Magnetic adatoms on a superconductor Sample
More informationw2dynamics : operation and applications
w2dynamics : operation and applications Giorgio Sangiovanni ERC Kick-off Meeting, 2.9.2013 Hackers Nico Parragh (Uni Wü) Markus Wallerberger (TU) Patrik Gunacker (TU) Andreas Hausoel (Uni Wü) A solver
More informationMikhail Katsnelson. Theory of Condensed Matter Institute for Molecules and Materials RU
Theory of carbon-based based magnetism Mikhail Katsnelson Theory of Condensed Matter Institute for Molecules and Materials RU Outline sp magnetism in general: why it is interesting? Defect-induced magnetism
More informationCover Page. The handle holds various files of this Leiden University dissertation.
Cover Page The handle http://hdl.handle.net/1887/49403 holds various files of this Leiden University dissertation. Author: Keesman, R. Title: Topological phases and phase transitions in magnets and ice
More informationThe end is (not) in sight: exact diagonalization, Lanczos, and DMRG
The end is (not) in sight: exact diagonalization, Lanczos, and DMRG Jürgen Schnack, Matthias Exler, Peter Hage, Frank Hesmer Department of Physics - University of Osnabrück http://www.physik.uni-osnabrueck.de/makrosysteme/
More informationIdeas on non-fermi liquid metals and quantum criticality. T. Senthil (MIT).
Ideas on non-fermi liquid metals and quantum criticality T. Senthil (MIT). Plan Lecture 1: General discussion of heavy fermi liquids and their magnetism Review of some experiments Concrete `Kondo breakdown
More informationAnomalous spin suscep.bility and suppressed exchange energy of 2D holes
Anomalous spin suscep.bility and suppressed exchange energy of 2D holes School of Chemical and Physical Sciences & MacDiarmid Ins7tute for Advanced Materials and Nanotechnology Victoria University of Wellington
More informationElectronic Properties of Ultimate Nanowires. F. J. Himpsel, S. C. Erwin, I. Barke,
Electronic Properties of Ultimate Nanowires F. J. Himpsel, S. C. Erwin, I. Barke, Nanostructures with Atomic Precision Single-Atom Wire, Single Wave Function Ultimate Limits of Electronics, Data Storage
More informationElectronic correlations in models and materials. Jan Kuneš
Electronic correlations in models and materials Jan Kuneš Outline Dynamical-mean field theory Implementation (impurity problem) Single-band Hubbard model MnO under pressure moment collapse metal-insulator
More informationDetecting and using Majorana fermions in superconductors
Detecting and using Majorana fermions in superconductors Anton Akhmerov with Carlo Beenakker, Jan Dahlhaus, Fabian Hassler, and Michael Wimmer New J. Phys. 13, 053016 (2011) and arxiv:1105.0315 Superconductor
More informationSUPPLEMENTARY INFORMATION
Electrical control of single hole spins in nanowire quantum dots V. S. Pribiag, S. Nadj-Perge, S. M. Frolov, J. W. G. van den Berg, I. van Weperen., S. R. Plissard, E. P. A. M. Bakkers and L. P. Kouwenhoven
More information