Gregory A. Fiete University of Texas at Austin
|
|
|
- Rosamond Young
- 5 years ago
- Views:
Transcription
1 Gregory A. Fiete University of Texas at Austin Ruegg, Fiete Phys. Rev B (Rapid) 84, (2011) Ruegg, Mitra, Demkov, Fiete Phys. Rev. B 85, (2012) Hu, Ruegg, Fiete Phys. Rev. B 86, (2012) [Editor s Suggestion] Ruegg, Mitra, Demkov, Fiete Phys. Rev. B 88, (2013)
2 Mehdi Kargarian Victor Chua Joseph Maciejko M. Kargarian and GAF, Phys. Rev. Lett. (2013) J. Maciejko, V. Chua, and GAF Phys. Rev. Lett. (2014) TCI* TCI W. Witczak-Krempa, G. Chen, Y.-B. Kim, L. Balents 2014 TCMI TI* Pesin & Balents Nat. Phys. 2010
3 LaAlO3/LaNiO3/LaAlO3 Andreas Ruegg Xiang Hu Chandrima Mitra Ruegg, Fiete Phys. Rev B (Rapid) 84, (2011) Ruegg, Mitra, Demkov, Fiete Phys. Rev. B 85, (2012) Hu, Ruegg, Fiete Phys. Rev. B 86, (2012) [Editor s Suggestion] Ruegg, Mitra, Demkov, Fiete Phys. Rev. B 88, (2013)
4 Outline Brief review of topological insulators: - Experiment and Theory ABO3 and A 2 M 2 O7 interfaces along [111]: - Time- reversal invariant TI - Time- reversal breaking QAH Promising experimental platforms for realizing interacting topological phases: oxides and engineered structures derived from them.
5 ARPES Iden0fied Topological Insulators (3- d): Bi 2 Se 3, Bi 2 Te 3,TlBiSe 2, Bi 2 Te 2 Se Bi 2 Se 3 Xia et al. Nat. Phys. 5, 398 (2009) Bi 2 Te 3 Chen et al. Science 325, 178 (2009) TlBiSe 2 Sato et al. PRL 105, (2010) Kuroda et al. PRL 105, (2010) DFT: Zhang et al. Nat. Phys. 5, 438 (2009) Bi 2 Te 2 Se: Single Dirac cone & most insulating bulk Z. Ren et al. PRB 82, (2010) (>70% surface conductivity)
6 Quantum spin Hall systems are 0me- reversal invariant cousins of Quantum Hall systems driven by spin- orbit coupling QAH if B=0 B=0 Common feature is dissipationless edge transport: simplest way to experimentally identify phases
7 Transport Iden0fied Topological Phases (2- d): HgCdTe quantum wells (TI) M. Konig et al. Science 318, 766 (2007) Width- independent conductance indicates transport along edge QAH state can be shown by measuring quantized Hall conductance in B=0 Experimentally observed in Cr-(Bi,Sb) 2 Te 3 : C.-Z. Chang,,Q.-K. Xue Science (2013)
8 Topological Classifica0on of 2- d Systems: Chern Number and Z 2 invariant Z invariant, Chern number (IQHE and QAH): Two-dimensional momentum space is topologically a torus: Z 2 invariant (TI): TRI momentum Z 2 invariant Parity eigenvalue (Inversion symmetry) Fu and Kane, PRL 2007 Modern formulas, G(k,0) Z. Wang & S.-C. Zhang PRX (2012)
9 Interac0ons in Two- Dimensional Systems: Add interac0ons to non- interac0ng band structure Dirac band touching points vs. quadratic band touching points (QBTP): kagome band structure Dirac points perturbatively stable against interactions QBTP perturbatively unstable to interactions Sun, Yao, Fradkin, and Kivelson, PRL 2009
10 An interes0ng new direc0on for topological phases: oxide heterostructures along [111] D. Xiao, W. Zhu, Y. Ran, N. Nagaosa, and S. Okamoto Nat. Comm. (2011) Potential TI e g e g LAO/LaAuO 3 /LAO E gap =1400 K B=0.3t B=2t Potential fractional quantum Hall states
11 (Local) Interac0on- driven topological phases in bilayer systems along [111]: LAO/LaNiO 3 /LAO K.-Y. Yang et al. PRB Rapid (2011); Ruegg and Fiete PRB Rapid (2011) U=U +2J I=J Generation of topological phases from purely local interactions even with zero spin-orbit coupling.
12 Extended Phase Diagram for LaNiO 3 Bilayer Ruegg, Mitra, Demkov, Fiete PRB 85, (2012) 1 st neighbor 2 nd neighbor DFT result (LDA) U=U +2J I=J LNO
13 Charge- transfer physics in LaNiO 3 Bilayer (Explicitly retain O p- orbitals) Ruegg, Mitra, Demkov, Fiete PRB 85, (2012) Mean-field (HF) Charge-transfer physics Related work: Andy Millis Group (explicit p-orbital)
14 LaUce Strain Effects: Internal Ruegg, Mitra, Demkov, Fiete PRB (2013) QBCP & Dirac point intact Internal lattice strain leaves unstrained picture essentially unchanged, even quantitatively!
15 LaUce Strain Effects: External Ruegg, Mitra, Demkov, Fiete Phys. Rev. B (2013) Apply symmetry-breaking strain along the [001] cubic direction: Dominant effect is orbital splitting: Externally imposed strain along [001] favors FO/AFM order. Topological phase unaffected.
16 Topological phases in single layer, bilayer, and trilayer pyrochlore systems along (111): A2M2O7 Hu, Ruegg, Fiete PRB (2012) Editors Suggestion B.-J. Yang and N. Nagaosa, arxiv: Z2 Topological Insulator fillings Kagome layer
17 Hartree- Fock Phase diagram for mul0layer A 2 Ir 2 O 7 Hu, Ruegg, Fiete, PRB (2012) Editors Suggestion t s =t f=1/2, ½-filled j=1/2 band Z 2 TI Chern Insulator t s =-t Non-coplanar spin order-> Chern number
18 Summary We have presented a number of interacting lattice models that realize topological phases. Transition metal oxides (Iridates in particular) appear to be promising venue for a variety of topological phases. Heterostructures allow an exceptional range of tunability and may form the basis of device applications of topological phases.
19 Predic0ons for topological phases in pyrochlore iridates (par0al) A 2 Ir 2 O7 (undistorted): D. Pesin, L. Balents, Nat. Phys. (2010) Topological Mott Insulator (TMI) A 2 Ir 2 O7 (distorted): B- J. Yang, Y.- B. Kim, PRB (2010) Single- particle type TI in non- interacting model A 2 Ir 2 O7 (distorted+interaction): M. Kargarian, J. Wen, GAF PRB (2011) Weak Topological Mott Insulator (WTMI) Y 2 Ir 2 O7 (magnetically ordered): Wan et al. PRB (2011) Weyl semi- metal A 2 Ir 2 O7: Go, Witczak- Krempa, Jeon, Park, Y.- B. Kim PRL (2012) Axion insulator (found via cellular DMFT) A 2 Ir 2 O7: M. Kargarian, GAF PRL (2013) Topological crystalline insulator, TCMI A 2 Ir 2 O7: J. Maciejko, V. Chua, GAF PRL (2014) TI*, SM*
20 Key energy scales: Minimal model for A 2 Ir 2 O 7? t~1.5 ev, E SOC ~0.5 ev, U~2 ev, E t2g- eg ~2 ev, Δ~ ev, J H ~0.5 ev Moreover, extended 5d orbitals may feel significant crystal fields beyond the local oxygen environment, e.g., Hozio et al., arxiv: Elements of minimal not entirely clear at present. W. Witczak-Krempa, G. Chen, Y.-B. Kim, L. Balents arxiv: A central issue for topological physics is the j=1/2 band structure, namely order of degeneracies at the Γ point: vs W. Witczak-Krempa and Y.-B. Kim, PRB (2012)
21 Topological phases in pyrochlore Iridate systems: A 2 Ir 2 O 7 Hartree- Fock Calcula0ons for j=1/2 Witczak-Krempa and Kim, PRB (2012) Weyl point
22 Predic0ons for topological phases in pyrochlore iridates with Γ- point degeneracies given A 2 Ir 2 O7 (undistorted): D. Pesin, L. Balents, Nat. Phys. (2010) Topological Mott Insulator (TMI) A 2 Ir 2 O7 (distorted): B- J. Yang, Y.- B. Kim, PRB (2010) Single- particle type TI in non- interacting model A 2 Ir 2 O7 (distorted+interaction): M. Kargarian, J. Wen, GAF PRB (2011) Weak Topological Mott Insulator (WTMI) Y 2 Ir 2 O7 (magnetically ordered): Wan et al. PRB (2011) Weyl semi- metal A 2 Ir 2 O7: Go, Witczak- Krempa, Jeon, Park, Y.- B. Kim PRL (2012) Axion insulator (found via cellular DMFT) A 2 Ir 2 O7: M. Kargarian, GAF PRL (2013) Topological crystalline insulator, TCMI A 2 Ir 2 O7: J. Maciejko, V. Chua, GAF arxiv: TI* , SM*
23 Schema0c Phase Diagram W. Witczak-Krempa, G. Chen, Y.-B. Kim, L. Balents arxiv: TCMI TI*, SM* TCI A 2 Ir 2 O7: M. Kargarian, GAF PRL (2013) Topological crystalline insulator, TCMI A 2 Ir 2 O7: J. Maciejko, V. Chua,GAF PRL (2014) TI* , SM* Pesin, Balents Nat. Phys. (2010)
24 Topological Crystalline Insulators: Mirror Chern Number Predicted by Liang Fu and collaborators: - - T. H. Hsieh, H. Lin, J. Liu, W. Duan, A. Bansil, L. Fu, Nat Commun, 3, 982 (2012). SnTe Material class - - Also recent, J. Liu, W. Duan, L. Fu arxiv: IV- VI semiconductors Realized essentially simultaneously by three groups: S.- Y. Xu, M. Z. Hasan, Nat Commun, 3, 1192 (2012) Pb 1- x Sn x Te Y. Tanaka, Y. Ando, Nat Phys, 8, 800 (2012). SnTe P. Dziawa, T. Story, Nat Mater, 11, 1023 (2012). Pb 1- x Sn x Se
25 Topological Crystalline Insulator (TCI) in A 2 Ir 2 O 7 M. Kargarian and GAF PRL (2013) States on the mirror plane can be organized by mirror eigenvalue +/- i Mirror Chern number is difference of Chern numbers for each mirror eigenstate: Pesin and Balents (2012) Teo, Fu, Kane PRB (2007)
26 Compu0ng TCI invariant for A 2 Ir 2 O 7 M. Kargarian and GAF PRL (2013) TRS Breaking, Mirror Preserved TRS Breaking, Mirror Broken
27 TCI edge states for A 2 Ir 2 O 7 : Slab geometry [010] Direc0on Mirror Planes: (101) and (101) M. Kargarian and GAF PRL (2013) TRS TRS TRS Breaking, Mirror Preserved TRS Breaking, Mirror Broken TRS+M
28 TCMI from slave rotors: Refined Phase Diagram M. Kargarian and GAF PRL (2013) TCMI TCI-1 TCI-2 Pesin and Balents Nat. Phys. (2010) charge spin Find that TMI is also TCMI a spin liquid with topological band structure protected by both time-reversal and mirror symmetries. TBI is two flavors of TCI.
29 TI* from slave spins: Topological Field Theory & Mean- field Theory J. Maciejko, V. Chua, GAF PRL (2014) Idea is to generalize QSH* phase to three- dimensions A. Ruegg and GAF PRL (2012) S. Huber and A. Ruegg PRL (2009) A. Ruegg, S. Huber, M. Sigrist PRB (2010) R. Nandkishore, M. A. Metliski, T. Senthil PRB (2012) Zhong, Wang, Luo arxiv: Exactly solvable models **J. Maciejko and A. Ruegg PRB (2013) CI* Phase
30 Field Theory for TI*: General J. Maciejko, V. Chua, GAF PRL (2014) Topological U=0 Local constraint: G r =1 Compute: where Find:
31 Field Theory for TI*: Low- energy J. Maciejko, V. Chua, GAF PRL (2014) Write Z 2 gauge theory in terms of U(1) gauge theory: Ukawa, Windey, Guth PRB (1980) where p=2 Integrate out gapped slave fermions and focus on deconfined TI* phase: U(1) gauge field weakly coupled, so lattice unimportant -> take the continuum limit. U(1) gauge invariance requires where is a compact U(1) 2-form. (3+1)-d level p BF term Cho & Moore Ann. Phys. (2011) Chan, Hughes, Ryu, Fradkin PRB (2013) After integrating out slave fermions, Integrate out : Topological degeneracy=8 on T 3 Non-trivial braid angle of 2π/p. TI-like magneto-electric response, but non-trivial ground state degeneracy and braiding statistics
32 Mean- Field Theory for TI*: Phase Diagram and Braiding J. Maciejko, V. Chua, GAF PRL (2014)
33 Summary W. Witczak-Krempa, G. Chen, Y.-B. Kim, L. Balents arxiv: TCI* TCMI TI*, SM* TCI A 2 Ir 2 O7: M. Kargarian, GAF PRL (2013) Topological crystalline insulator, TCMI A 2 Ir 2 O7: J. Maciejko, V. Chua,GAF arxiv: TI* , SM* Pesin, Balents Nat. Phys. (2010)
34 Experimental Phase Diagram for Bulk Pyrochlore Iridates W. Witczak-Krempa, G. Chen, Y.-B. Kim, L. Balents arxiv: Overall, these particular materials do not look promising for topological phases.
35 Experimental Phase Diagram for Bulk Pyrochlore Iridates W. Witczak-Krempa, G. Chen, Y.-B. Kim, L. Balents arxiv: Overall, these particular materials do not look promising for topological phases. But thin films are a different story!
36 Experimental Phase Diagram for Bulk Pyrochlore Iridates and Bulk Perovksite Nickelates W. Witczak-Krempa, G. Chen, Y.-B. Kim, L. Balents arxiv: R 2 Ir 2 O 7 RNiO 3 Overall, these particular materials do not look promising for topological phases. From Triscone Group Website But thin films are a different story!
37 Experimental Results Midday, Meyers, Kareev, Moon, Gray, Moon, Liu, Freeland, Chakhalian Appl. Phys. Lett. (2012).
Introductory lecture on topological insulators. Reza Asgari
Introductory lecture on topological insulators Reza Asgari Workshop on graphene and topological insulators, IPM. 19-20 Oct. 2011 Outlines -Introduction New phases of materials, Insulators -Theory quantum
Emergent topological phenomena in antiferromagnets with noncoplanar spins
Emergent topological phenomena in antiferromagnets with noncoplanar spins - Surface quantum Hall effect - Dimensional crossover Bohm-Jung Yang (RIKEN, Center for Emergent Matter Science (CEMS), Japan)
Quantitative Mappings from Symmetry to Topology
Z. Song, Z. Fang and CF, PRL 119, 246402 (2017) CF and L. Fu, arxiv:1709.01929 Z. Song, T. Zhang, Z. Fang and CF arxiv:1711.11049 Z. Song, T. Zhang and CF arxiv:1711.11050 Quantitative Mappings from Symmetry
/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
Topological Defects inside a Topological Band Insulator
Topological Defects inside a Topological Band Insulator Ashvin Vishwanath UC Berkeley Refs: Ran, Zhang A.V., Nature Physics 5, 289 (2009). Hosur, Ryu, AV arxiv: 0908.2691 Part 1: Outline A toy model of
Spin Hall and quantum spin Hall effects. Shuichi Murakami Department of Physics, Tokyo Institute of Technology PRESTO, JST
YKIS2007 (Kyoto) Nov.16, 2007 Spin Hall and quantum spin Hall effects Shuichi Murakami Department of Physics, Tokyo Institute of Technology PRESTO, JST Introduction Spin Hall effect spin Hall effect in
LCI -birthplace of liquid crystal display. May, protests. Fashion school is in top-3 in USA. Clinical Psychology program is Top-5 in USA
LCI -birthplace of liquid crystal display May, 4 1970 protests Fashion school is in top-3 in USA Clinical Psychology program is Top-5 in USA Topological insulators driven by electron spin Maxim Dzero Kent
Topological Kondo Insulator SmB 6. Tetsuya Takimoto
Topological Kondo Insulator SmB 6 J. Phys. Soc. Jpn. 80 123720, (2011). Tetsuya Takimoto Department of Physics, Hanyang University Collaborator: Ki-Hoon Lee (POSTECH) Content 1. Introduction of SmB 6 in-gap
Topological Insulators
Topological Insulators A new state of matter with three dimensional topological electronic order L. Andrew Wray Lawrence Berkeley National Lab Princeton University Surface States (Topological Order in
Symmetry Protected Topological Insulators and Semimetals
Symmetry Protected Topological Insulators and Semimetals I. Introduction : Many examples of topological band phenomena II. Recent developments : - Line node semimetal Kim, Wieder, Kane, Rappe, PRL 115,
Topological Insulators and Superconductors. Tokyo 2010 Shoucheng Zhang, Stanford University
Topological Insulators and Superconductors Tokyo 2010 Shoucheng Zhang, Stanford University Colloborators Stanford group: Xiaoliang Qi, Andrei Bernevig, Congjun Wu, Chaoxing Liu, Taylor Hughes, Sri Raghu,
Basics of topological insulator
011/11/18 @ NTU Basics of topological insulator Ming-Che Chang Dept of Physics, NTNU A brief history of insulators Band insulator (Wilson, Bloch) Mott insulator Anderson insulator Quantum Hall insulator
Topological Insulators in 3D and Bosonization
Topological Insulators in 3D and Bosonization Andrea Cappelli, INFN Florence (w. E. Randellini, J. Sisti) Outline Topological states of matter: bulk and edge Fermions and bosons on the (1+1)-dimensional
Dirac fermions in condensed matters
Dirac fermions in condensed matters Bohm Jung Yang Department of Physics and Astronomy, Seoul National University Outline 1. Dirac fermions in relativistic wave equations 2. How do Dirac fermions appear
Topological insulators and the quantum anomalous Hall state. David Vanderbilt Rutgers University
Topological insulators and the quantum anomalous Hall state David Vanderbilt Rutgers University Outline Berry curvature and topology 2D quantum anomalous Hall (QAH) insulator TR-invariant insulators (Z
Stability of semi-metals : (partial) classification of semi-metals
: (partial) classification of semi-metals Eun-Gook Moon Department of Physics, UCSB EQPCM 2013 at ISSP, Jun 20, 2013 Collaborators Cenke Xu, UCSB Yong Baek, Kim Univ. of Toronto Leon Balents, KITP B.J.
Influence of tetragonal distortion on the topological electronic structure. of the half-heusler compound LaPtBi from first principles
Influence of tetragonal distortion on the topological electronic structure of the half-heusler compound LaPtBi from first principles X. M. Zhang, 1,3 W. H. Wang, 1, a) E. K. Liu, 1 G. D. Liu, 3 Z. Y. Liu,
ARPES experiments on 3D topological insulators. Inna Vishik Physics 250 (Special topics: spectroscopies of quantum materials) UC Davis, Fall 2016
ARPES experiments on 3D topological insulators Inna Vishik Physics 250 (Special topics: spectroscopies of quantum materials) UC Davis, Fall 2016 Outline Using ARPES to demonstrate that certain materials
Topological insulators
http://www.physik.uni-regensburg.de/forschung/fabian Topological insulators Jaroslav Fabian Institute for Theoretical Physics University of Regensburg Stara Lesna, 21.8.212 DFG SFB 689 what are topological
Topological Insulators
Topological Insulators Aira Furusai (Condensed Matter Theory Lab.) = topological insulators (3d and 2d) Outline Introduction: band theory Example of topological insulators: integer quantum Hall effect
Crystalline Symmetry and Topology. YITP, Kyoto University Masatoshi Sato
Crystalline Symmetry and Topology YITP, Kyoto University Masatoshi Sato In collaboration with Ken Shiozaki (YITP) Kiyonori Gomi (Shinshu University) Nobuyuki Okuma (YITP) Ai Yamakage (Nagoya University)
Dirac-Fermion-Induced Parity Mixing in Superconducting Topological Insulators. Nagoya University Masatoshi Sato
Dirac-Fermion-Induced Parity Mixing in Superconducting Topological Insulators Nagoya University Masatoshi Sato In collaboration with Yukio Tanaka (Nagoya University) Keiji Yada (Nagoya University) Ai Yamakage
What is a topological insulator? Ming-Che Chang Dept of Physics, NTNU
What is a topological insulator? Ming-Che Chang Dept of Physics, NTNU A mini course on topology extrinsic curvature K vs intrinsic (Gaussian) curvature G K 0 G 0 G>0 G=0 K 0 G=0 G
Field Theory Description of Topological States of Matter. Andrea Cappelli INFN, Florence (w. E. Randellini, J. Sisti)
Field Theory Description of Topological States of Matter Andrea Cappelli INFN, Florence (w. E. Randellini, J. Sisti) Topological States of Matter System with bulk gap but non-trivial at energies below
Proximity-induced magnetization dynamics, interaction effects, and phase transitions on a topological surface
Proximity-induced magnetization dynamics, interaction effects, and phase transitions on a topological surface Ilya Eremin Theoretische Physik III, Ruhr-Uni Bochum Work done in collaboration with: F. Nogueira
Topological nonsymmorphic crystalline superconductors
UIUC, 10/26/2015 Topological nonsymmorphic crystalline superconductors Chaoxing Liu Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA Chao-Xing Liu, Rui-Xing
Quantum Spin Liquids and Majorana Metals
Quantum Spin Liquids and Majorana Metals Maria Hermanns University of Cologne M.H., S. Trebst, PRB 89, 235102 (2014) M.H., K. O Brien, S. Trebst, PRL 114, 157202 (2015) M.H., S. Trebst, A. Rosch, arxiv:1506.01379
arxiv: v1 [cond-mat.mes-hall] 29 Jul 2010
![arxiv: v1 [cond-mat.mes-hall] 29 Jul 2010](/thumbs/94/121300146.jpg "arxiv: v1 [cond-mat.mes-hall] 29 Jul 2010")
Discovery of several large families of Topological Insulator classes with backscattering-suppressed spin-polarized single-dirac-cone on the surface arxiv:1007.5111v1 [cond-mat.mes-hall] 29 Jul 2010 Su-Yang
SPT: a window into highly entangled phases
SPT: a window into highly entangled phases T. Senthil (MIT) Collaborators: Chong Wang, A. Potter Why study SPT? 1. Because it may be there... Focus on electronic systems with realistic symmetries in d
Energy Spectrum and Broken spin-surface locking in Topological Insulator quantum dots
Energy Spectrum and Broken spin-surface locking in Topological Insulator quantum dots A. Kundu 1 1 Heinrich-Heine Universität Düsseldorf, Germany The Capri Spring School on Transport in Nanostructures
IRG-1 CEM CENTER FOR EMERGENT MATERIALS SPIN-ORBIT COUPLING IN CORRELATED MATERIALS: SEARCH FOR NOVEL PHASES AND PHENOMENA
IRG-1 SPIN-ORBIT COUPLING IN CORRELATED MATERIALS: SEARCH FOR NOVEL PHASES AND PHENOMENA Co-leads: N. Trivedi & P. M. Woodward 3 June 2014 Center for Emergent Materials an NSF MRSEC IRG-1 1 Spin orbit
Disordered topological insulators with time-reversal symmetry: Z 2 invariants
Keio Topo. Science (2016/11/18) Disordered topological insulators with time-reversal symmetry: Z 2 invariants Hosho Katsura Department of Physics, UTokyo Collaborators: Yutaka Akagi (UTokyo) Tohru Koma
Weyl semimetals and topological phase transitions
Weyl semimetals and topological phase transitions Shuichi Murakami 1 Department of Physics, Tokyo Institute of Technology 2 TIES, Tokyo Institute of Technology 3 CREST, JST Collaborators: R. Okugawa (Tokyo
The Quantum Spin Hall Effect
The Quantum Spin Hall Effect Shou-Cheng Zhang Stanford University with Andrei Bernevig, Taylor Hughes Science, 314,1757 2006 Molenamp et al, Science, 318, 766 2007 XL Qi, T. Hughes, SCZ preprint The quantum
Structure and Topology of Band Structures in the 1651 Magnetic Space Groups
Structure and Topology of Band Structures in the 1651 Magnetic Space Groups Haruki Watanabe University of Tokyo [Noninteracting] Sci Adv (2016) PRL (2016) Nat Commun (2017) (New) arxiv:1707.01903 [Interacting]
arxiv: v1 [cond-mat.str-el] 6 May 2010
![arxiv: v1 [cond-mat.str-el] 6 May 2010](/thumbs/81/83686509.jpg "arxiv: v1 [cond-mat.str-el] 6 May 2010")
MIT-CTP/4147 Correlated Topological Insulators and the Fractional Magnetoelectric Effect B. Swingle, M. Barkeshli, J. McGreevy, and T. Senthil Department of Physics, Massachusetts Institute of Technology,
5 Topological insulator with time-reversal symmetry
Phys62.nb 63 5 Topological insulator with time-reversal symmetry It is impossible to have quantum Hall effect without breaking the time-reversal symmetry. xy xy. If we want xy to be invariant under, xy
Classification of topological quantum matter with reflection symmetries
Classification of topological quantum matter with reflection symmetries Andreas P. Schnyder Max Planck Institute for Solid State Research, Stuttgart June 14th, 2016 SPICE Workshop on New Paradigms in Dirac-Weyl
Topological insulator (TI)
Topological insulator (TI) Haldane model: QHE without Landau level Quantized spin Hall effect: 2D topological insulators: Kane-Mele model for graphene HgTe quantum well InAs/GaSb quantum well 3D topological
Vortex States in a Non-Abelian Magnetic Field
Vortex States in a Non-Abelian Magnetic Field Predrag Nikolić George Mason University Institute for Quantum Matter @ Johns Hopkins University SESAPS November 10, 2016 Acknowledgments Collin Broholm IQM
3D Weyl metallic states realized in the Bi 1-x Sb x alloy and BiTeI. Heon-Jung Kim Department of Physics, Daegu University, Korea
3D Weyl metallic states realized in the Bi 1-x Sb x alloy and BiTeI Heon-Jung Kim Department of Physics, Daegu University, Korea Content 3D Dirac metals Search for 3D generalization of graphene Bi 1-x
Chiral Majorana fermion from quantum anomalous Hall plateau transition
Chiral Majorana fermion from quantum anomalous Hall plateau transition Phys. Rev. B, 2015 王靖复旦大学物理系 wjingphys@fudan.edu.cn Science, 2017 1 Acknowledgements Stanford Biao Lian Quan Zhou Xiao-Liang Qi Shou-Cheng
Cenke Xu. Quantum Phase Transitions between Bosonic Symmetry Protected Topological States without sign problem 许岑珂
Quantum Phase Transitions between Bosonic Symmetry Protected Topological States without sign problem Cenke Xu 许岑珂 University of California, Santa Barbara Quantum Phase Transitions between bosonic Symmetry
Quantum anomalous Hall states on decorated magnetic surfaces
Quantum anomalous Hall states on decorated magnetic surfaces David Vanderbilt Rutgers University Kevin Garrity & D.V. Phys. Rev. Lett.110, 116802 (2013) Recently: Topological insulators (TR-invariant)
Dirac semimetal in three dimensions
Dirac semimetal in three dimensions Steve M. Young, Saad Zaheer, Jeffrey C. Y. Teo, Charles L. Kane, Eugene J. Mele, and Andrew M. Rappe University of Pennsylvania 6/7/12 1 Dirac points in Graphene Without
Ultrafast study of Dirac fermions in out of equilibrium Topological Insulators
Ultrafast study of Dirac fermions in out of equilibrium Topological Insulators Marino Marsi Laboratoire de Physique des Solides CNRS Univ. Paris-Sud - Université Paris-Saclay IMPACT, Cargèse, August 26
Ultrafast surface carrier dynamics in topological insulators: Bi 2 Te 3. Marino Marsi
Ultrafast surface carrier dynamics in topological insulators: Bi 2 Te 3 Marino Marsi Laboratoire de Physique des Solides CNRS UMR 8502 - Université Paris-Sud IMPACT, Orsay, September 2012 Outline Topological
Surface Majorana Fermions in Topological Superconductors. ISSP, Univ. of Tokyo. Nagoya University Masatoshi Sato
Surface Majorana Fermions in Topological Superconductors ISSP, Univ. of Tokyo Nagoya University Masatoshi Sato Kyoto Tokyo Nagoya In collaboration with Satoshi Fujimoto (Kyoto University) Yoshiro Takahashi
Effective Field Theories of Topological Insulators
Effective Field Theories of Topological Insulators Eduardo Fradkin University of Illinois at Urbana-Champaign Workshop on Field Theoretic Computer Simulations for Particle Physics and Condensed Matter
Topological Insulators and Ferromagnets: appearance of flat surface bands
Topological Insulators and Ferromagnets: appearance of flat surface bands Thomas Dahm University of Bielefeld T. Paananen and T. Dahm, PRB 87, 195447 (2013) T. Paananen et al, New J. Phys. 16, 033019 (2014)
First-Principles Calculation of Topological Invariants (Wannier Functions Approach) Alexey A. Soluyanov
First-Principles Calculation of Topological Invariants (Wannier Functions Approach) Alexey A. Soluyanov ES'12, WFU, June 8, 212 The present work was done in collaboration with David Vanderbilt Outline:
SPIN-LIQUIDS ON THE KAGOME LATTICE: CHIRAL TOPOLOGICAL, AND GAPLESS NON-FERMI-LIQUID PHASE
SPIN-LIQUIDS ON THE KAGOME LATTICE: CHIRAL TOPOLOGICAL, AND GAPLESS NON-FERMI-LIQUID PHASE ANDREAS W.W. LUDWIG (UC-Santa Barbara) work done in collaboration with: Bela Bauer (Microsoft Station-Q, Santa
Introduction to topological insulators. Jennifer Cano
Introduction to topological insulators Jennifer Cano Adapted from Charlie Kane s Windsor Lectures: http://www.physics.upenn.edu/~kane/ Review article: Hasan & Kane Rev. Mod. Phys. 2010 What is an insulator?
Symmetric Surfaces of Topological Superconductor
Symmetric Surfaces of Topological Superconductor Sharmistha Sahoo Zhao Zhang Jeffrey Teo Outline Introduction Brief description of time reversal symmetric topological superconductor. Coupled wire model
TOPOLOGY IN CONDENSED MATTER SYSTEMS: MAJORANA MODES AND WEYL SEMIMETALS. Jan 23, 2012, University of Illinois, Urbana-Chamapaign
TOPOLOGY IN CONDENSED MATTER SYSTEMS: MAJORANA MODES AND WEYL SEMIMETALS Pavan Hosur UC Berkeley Jan 23, 2012, University of Illinois, Urbana-Chamapaign Acknowledgements Advisor: Ashvin Vishwanath UC Berkeley
Notes on Topological Insulators and Quantum Spin Hall Effect. Jouko Nieminen Tampere University of Technology.
Notes on Topological Insulators and Quantum Spin Hall Effect Jouko Nieminen Tampere University of Technology. Not so much discussed concept in this session: topology. In math, topology discards small details
Spinon magnetic resonance. Oleg Starykh, University of Utah
Spinon magnetic resonance Oleg Starykh, University of Utah May 17-19, 2018 Examples of current literature 200 cm -1 = 6 THz Spinons? 4 mev = 1 THz The big question(s) What is quantum spin liquid? No broken
Weyl semi-metal: a New Topological State in Condensed Matter
Weyl semi-metal: a New Topological State in Condensed Matter Sergey Savrasov Department of Physics, University of California, Davis Xiangang Wan Nanjing University Ari Turner and Ashvin Vishwanath UC Berkeley
(Effective) Field Theory and Emergence in Condensed Matter
(Effective) Field Theory and Emergence in Condensed Matter T. Senthil (MIT) Effective field theory in condensed matter physics Microscopic models (e.g, Hubbard/t-J, lattice spin Hamiltonians, etc) `Low
Weyl semimetals from chiral anomaly to fractional chiral metal
Weyl semimetals from chiral anomaly to fractional chiral metal Jens Hjörleifur Bárðarson Max Planck Institute for the Physics of Complex Systems, Dresden KTH Royal Institute of Technology, Stockholm J.
arxiv: v1 [cond-mat.mtrl-sci] 20 Jan 2015
![arxiv: v1 [cond-mat.mtrl-sci] 20 Jan 2015](/thumbs/74/70163917.jpg "arxiv: v1 [cond-mat.mtrl-sci] 20 Jan 2015")
Quantum Spin Hall Effect in IV-VI Topological Crystalline Insulators S. Safaei, 1 M. Galicka, 1 P. Kacman, 1,2 and R. Buczko 1, 1 Institute of Physics, Polish Academy of Sciences, Aleja Lotników 32/46,
arxiv: v2 [cond-mat.mes-hall] 21 Oct 2011
![arxiv: v2 [cond-mat.mes-hall] 21 Oct 2011](/thumbs/95/124602865.jpg "arxiv: v2 [cond-mat.mes-hall] 21 Oct 2011")
Topological Quantum Phase Transition and 3D Texture Inversion in a Tunable Topological Insulator Su-Yang Xu, 1 Y. Xia, 1 L. A. Wray, 1,2 D. Qian, 1 S. Jia, 3 J. H. Dil, 4,5 F. Meier, 4,5 arxiv:1104.4633v2
Building Frac-onal Topological Insulators. Collaborators: Michael Levin Maciej Kosh- Janusz Ady Stern
Building Frac-onal Topological Insulators Collaborators: Michael Levin Maciej Kosh- Janusz Ady Stern The program Background: Topological insulators Frac-onaliza-on Exactly solvable Hamiltonians for frac-onal
Classification of Symmetry Protected Topological Phases in Interacting Systems
Classification of Symmetry Protected Topological Phases in Interacting Systems Zhengcheng Gu (PI) Collaborators: Prof. Xiao-Gang ang Wen (PI/ PI/MIT) Prof. M. Levin (U. of Chicago) Dr. Xie Chen(UC Berkeley)
Unconventional pairing in three-dimensional topological insulators with warped surface state Andrey Vasenko
Unconventional pairing in three-dimensional topological insulators with warped surface state Andrey Vasenko Moscow Institute of Electronics and Mathematics, Higher School of Economics Collaborators Alexander
Effects of biaxial strain on the electronic structures and band. topologies of group-v elemental monolayers
Effects of biaxial strain on the electronic structures and band topologies of group-v elemental monolayers Jinghua Liang, Long Cheng, Jie Zhang, Huijun Liu * Key Laboratory of Artificial Micro- and Nano-Structures
Γ M. Multiple Dirac cones and spontaneous QAH state in transition metal trichalcogenides. Yusuke Sugita
Γ M K Multiple Dirac cones and spontaneous QAH state in transition metal trichalcogenides Yusuke Sugita collaborators Takashi Miyake (AIST) Yukitoshi Motome (U.Tokyo) 2017/10/24 @ NQS 2017 1 Outline Introduction
Studying Topological Insulators. Roni Ilan UC Berkeley
Studying Topological Insulators via time reversal symmetry breaking and proximity effect Roni Ilan UC Berkeley Joel Moore, Jens Bardarson, Jerome Cayssol, Heung-Sun Sim Topological phases Insulating phases
Time - domain THz spectroscopy on the topological insulator Bi2Se3 (and its superconducting bilayers)
Time - domain THz spectroscopy on the topological insulator Bi2Se3 (and its superconducting bilayers) N. Peter Armitage The Institute of Quantum Matter The Johns Hopkins University Acknowledgements Liang
team Hans Peter Büchler Nicolai Lang Mikhail Lukin Norman Yao Sebastian Huber
title 1 team 2 Hans Peter Büchler Nicolai Lang Mikhail Lukin Norman Yao Sebastian Huber motivation: topological states of matter 3 fermions non-interacting, filled band (single particle physics) topological
Supplementary Information: Observation of a topological crystalline insulator phase and topological phase transition in Pb 1 x Sn x Te
Supplementary Information: Observation of a topological crystalline insulator phase and topological phase transition in Pb 1 x Sn x Te Su-Yang Xu, Chang Liu, N. Alidoust, M. Neupane, D. Qian, I. Belopolski,
Topological Physics in Band Insulators II
Topological Physics in Band Insulators II Gene Mele University of Pennsylvania Topological Insulators in Two and Three Dimensions The canonical list of electric forms of matter is actually incomplete Conductor
Observation of Dirac node formation and mass acquisition in a topological crystalline insulator
Observation of Dirac node formation and mass acquisition in a topological crystalline insulator Yoshinori Okada 1, 2, Maksym Serbyn* 3, Hsin Lin* 4, Daniel Walkup 1, Wenwen Zhou 1, Chetan Dhital 1, Madhab
arxiv: v1 [cond-mat.other] 20 Apr 2010
![arxiv: v1 [cond-mat.other] 20 Apr 2010](/thumbs/93/114512366.jpg "arxiv: v1 [cond-mat.other] 20 Apr 2010")
Characterization of 3d topological insulators by 2d invariants Rahul Roy Rudolf Peierls Centre for Theoretical Physics, 1 Keble Road, Oxford, OX1 3NP, UK arxiv:1004.3507v1 [cond-mat.other] 20 Apr 2010
From graphene to Z2 topological insulator
From graphene to Z2 topological insulator single Dirac topological AL mass U U valley WL ordinary mass or ripples WL U WL AL AL U AL WL Rashba Ken-Ichiro Imura Condensed-Matter Theory / Tohoku Univ. Dirac
Kai Sun. University of Michigan, Ann Arbor. Collaborators: Krishna Kumar and Eduardo Fradkin (UIUC)
Kai Sun University of Michigan, Ann Arbor Collaborators: Krishna Kumar and Eduardo Fradkin (UIUC) Outline How to construct a discretized Chern-Simons gauge theory A necessary and sufficient condition for
KITP miniprogram, Dec. 11, 2008
1. Magnetoelectric polarizability in 3D insulators and experiments! 2. Topological insulators with interactions (3. Critical Majorana fermion chain at the QSH edge) KITP miniprogram, Dec. 11, 2008 Joel
Topological Electromagnetic and Thermal Responses of Time-Reversal Invariant Superconductors and Chiral-Symmetric band insulators
Topological Electromagnetic and Thermal Responses of Time-Reversal Invariant Superconductors and Chiral-Symmetric band insulators Satoshi Fujimoto Dept. Phys., Kyoto University Collaborator: Ken Shiozaki
Massive Dirac Fermion on the Surface of a magnetically doped Topological Insulator
SLAC-PUB-14357 Massive Dirac Fermion on the Surface of a magnetically doped Topological Insulator Y. L. Chen 1,2,3, J.-H. Chu 1,2, J. G. Analytis 1,2, Z. K. Liu 1,2, K. Igarashi 4, H.-H. Kuo 1,2, X. L.
Loop current order in optical lattices
JQI Summer School June 13, 2014 Loop current order in optical lattices Xiaopeng Li JQI/CMTC Outline Ultracold atoms confined in optical lattices 1. Why we care about lattice? 2. Band structures and Berry
Universal phase transitions in Topological lattice models
Universal phase transitions in Topological lattice models F. J. Burnell Collaborators: J. Slingerland S. H. Simon September 2, 2010 Overview Matter: classified by orders Symmetry Breaking (Ferromagnet)
Floquet theory of photo-induced topological phase transitions: Application to graphene
Floquet theory of photo-induced topological phase transitions: Application to graphene Takashi Oka (University of Tokyo) T. Kitagawa (Harvard) L. Fu (Harvard) E. Demler (Harvard) A. Brataas (Norweigian
Topological Insulators on the Ruby Lattice with Rashba Spin-Orbit Coupling
Commun. Theor. Phys. 60 (2013) 129 135 Vol. 60, No. 1, July 15, 2013 Topological Insulators on the Ruby Lattice with Rashba Spin-Orbit Coupling HOU Jing-Min ( ) and WANG Guo-Xiang ( ) Department of Physics,
Topological Kondo Insulators!
Topological Kondo Insulators! Maxim Dzero, University of Maryland Collaborators: Kai Sun, University of Maryland Victor Galitski, University of Maryland Piers Coleman, Rutgers University Main idea Kondo
Visualizing Electronic Structures of Quantum Materials By Angle Resolved Photoemission Spectroscopy (ARPES)
Visualizing Electronic Structures of Quantum Materials By Angle Resolved Photoemission Spectroscopy (ARPES) PART A: ARPES & Application Yulin Chen Oxford University / Tsinghua University www.arpes.org.uk
Dirac matter: Magneto-optical studies
Dirac matter: Magneto-optical studies Marek Potemski Laboratoire National des Champs Magnétiques Intenses Grenoble High Magnetic Field Laboratory CNRS/UGA/UPS/INSA/EMFL MOMB nd International Conference
Braid Group, Gauge Invariance and Topological Order
Braid Group, Gauge Invariance and Topological Order Yong-Shi Wu Department of Physics University of Utah Topological Quantum Computing IPAM, UCLA; March 2, 2007 Outline Motivation: Topological Matter (Phases)
Quantum spin Hall effect in IV-VI topological crystalline insulators
PAPER OPEN ACCESS Quantum spin Hall effect in IV-VI topological crystalline insulators To cite this article: 2015 New J. Phys. 17 063041 View the article online for updates and enhancements. Related content
GROWTH OF QUANTUM WELL FILMS OF TOPOLOGICAL INSULATOR BI 2 SE 3 ON INSULATING SUBSTRATE
GROWTH OF QUANTUM WELL FILMS OF TOPOLOGICAL INSULATOR BI 2 SE 3 ON INSULATING SUBSTRATE CUI-ZU CHANG, KE HE *, LI-LI WANG AND XU-CUN MA Institute of Physics, Chinese Academy of Sciences, Beijing 100190,
Topological Insulators and Superconductors
Topological Insulators and Superconductors Lecture #1: Topology and Band Theory Lecture #: Topological Insulators in and 3 dimensions Lecture #3: Topological Superconductors, Majorana Fermions an Topological
Symmetry Protected Topological Phases of Matter
Symmetry Protected Topological Phases of Matter T. Senthil (MIT) Review: T. Senthil, Annual Reviews of Condensed Matter Physics, 2015 Topological insulators 1.0 Free electron band theory: distinct insulating
Bosonic Symmetry Protected Topological States: Theory, Numerics, And Experimental Platform. Zhen Bi University of California, Santa Barbara
Bosonic Symmetry Protected Topological States: Theory, Numerics, And Experimental Platform Zhen Bi University of California, Santa Barbara Acknowledgements Collaborators from UCSB: Cenke Xu, Leon Balents,
Floquet Topological Insulators and Majorana Modes
Floquet Topological Insulators and Majorana Modes Manisha Thakurathi Journal Club Centre for High Energy Physics IISc Bangalore January 17, 2013 References Floquet Topological Insulators by J. Cayssol
Emergent gauge fields and the high temperature superconductors
HARVARD Emergent gauge fields and the high temperature superconductors Unifying physics and technology in light of Maxwell s equations The Royal Society, London November 16, 2015 Subir Sachdev Talk online:
Topological Photonics with Heavy-Photon Bands
Topological Photonics with Heavy-Photon Bands Vassilios Yannopapas Dept. of Physics, National Technical University of Athens (NTUA) Quantum simulations and many-body physics with light, 4-11/6/2016, Hania,
Physics in two dimensions in the lab
Physics in two dimensions in the lab Nanodevice Physics Lab David Cobden PAB 308 Collaborators at UW Oscar Vilches (Low Temperature Lab) Xiaodong Xu (Nanoscale Optoelectronics Lab) Jiun Haw Chu (Quantum
Weyl fermions and the Anomalous Hall Effect
Weyl fermions and the Anomalous Hall Effect Anton Burkov CAP congress, Montreal, May 29, 2013 Outline Introduction: Weyl fermions in condensed matter, Weyl semimetals. Anomalous Hall Effect in ferromagnets
Kitaev honeycomb lattice model: from A to B and beyond
Kitaev honeycomb lattice model: from A to B and beyond Jiri Vala Department of Mathematical Physics National University of Ireland at Maynooth Postdoc: PhD students: Collaborators: Graham Kells Ahmet Bolukbasi
Topological insulator with time-reversal symmetry
Phys620.nb 101 7 Topological insulator with time-reversal symmetry Q: Can we get a topological insulator that preserves the time-reversal symmetry? A: Yes, with the help of the spin degree of freedom.
Experimental Reconstruction of the Berry Curvature in a Floquet Bloch Band
Experimental Reconstruction of the Berry Curvature in a Floquet Bloch Band Christof Weitenberg with: Nick Fläschner, Benno Rem, Matthias Tarnowski, Dominik Vogel, Dirk-Sören Lühmann, Klaus Sengstock Rice