QS School Summary
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1 2018 NSF/DOE/AFOSR Quantum Science Summer School June 22, 2018 QS School Summary Kyle Shen (Cornell)
2 Some Thank yous! A Big Thanks to Caroline Brockner!!! Also to our fantastic speakers! Kavli Cornell & David Muller for weekend outing NSF, DOE, AFOSR
3 Balents: Overview of Quantum Materials
4 Giustino: Density Functional Theory Powerful technique, very broadly applied, has shortcomings, continuously being improved
5 Davis: STM of Quantum Materials Stephen Edkins PhD Thesis Topography, local density of states, quasi particle interference
6 Chan: Bulk Synthesis of Quantum Materials Many different methods Relies on experience and materials knowledge Phelan, W.A.; Menard, M.C.; Kangas, M.J.; McCandless, G.T.; Drake, B.; Chan, J.Y. Adventures in Crystal Growth: Synthesis and Characterization of Single Crystals of Complex Intermetallic Compounds Chem. Mater., 2012, 24,
7 Muller: Electron Microscopy of Quantum Materials Chien et al., Nat Comm 4, 2336 (2013) 2 nm Can probe structure, composition, magnetic order, and more! Van der Zande et al., Nat Mat 12, 554 (2013)
8 Vishik: ARPES of Quantum Materials Important tool for electronic band structure
9 Armitage: Optical & THz spectroscopy of Quantum Materials A tool to study electrodynamic properties of conducting electrons Plasma frequency, scattering rate, effective mass of charge carriers for free or weakly interacting electron gas in metals Size of superconducting gap Pb, thin films 2 Topological properties Quantized Faraday rotation topological insulator Bi2Se3 films
10 Schlom: Molecular Beam Epitaxy of Quantum Materials Equipment Intensive, material exquisite control
11 Shan: Two Dimensional Quantum Materials Single layer materials: graphene, MoS 2, WS 2, etc quantum confinement effects due to a single layer Measurements of Berry phase in graphene Valley hall effect N2
12 Ruff: X Ray Scattering on Quantum Materials X ray absorption: White line Probing magnetism with x ray magnetic circular dichroism (XMCD) XMCD (arb. units) X A (arb. units) L 3 L 2 I XMCD = I I photon energy (ev) Fe 2p 3/2 L 3 2p 1/2 L 2 Co Credit: Elke Arenholz, LBNL core level valence states FeCo_GaAs_XMCD.opj Elastic scattering, absorption and emission spectroscopy resonance elastic scattering, resonant inelastic scattering, x ray magnetic circular dichroism + + +
13 Cha: Nanoscale Quantum Materials Vapor-Liquid-solid growth of nanowires Nanostructure approach to study topological Insulators and topological superconductors Si nanowires Au In doped SnTe 10 nm Growth Cui and Lieber, App. Phys. Lett. 78, Page (2001). Ar InTe SnTe (111) In doped SnTe Nanoplate Nano Lett. 15 p (2015) PRB 88, (2013), PRL 109, (2012), PRL 110, (2013), PRB 93, (2016),
14 Tranquada: Neutron Scattering on Quantum Materials Elastic and Inelastic scattering Probe of structure, magnetism, and more! High Resolution Spectrometer at ISIS M. Mourigal et al., Nat Phys 9, 435 (2013)
15 Modeling Quantum Materials Computer Aided Visualization 3D printing of structures VR modeling
16 Synthesis Methods Bulk Growth Thin Film Growth
17 Characterization Methods
18 Characterization Methods Spectroscopic bulk methods Optical/IR spectroscopy Neutron scattering X ray scattering EELS (to some extend) ARPES (to some extend) Superconducting gap in YBCO Optical spectroscopy Surface methods STM STEM ARPES STM Dynamic stripes in YBCO by neutron scattering STM image of graphene ARPES of graphene
19 High Temperature Superconductors Continues to be one of the most important problems in quantum materials Pathways to higher T C?
20 Topological Materials Protected Boundary modes New class of materials (10 years old) overlooked in band theory Useful? Lanzara Group
21 Correlated Materials Coupling of multiple degrees of freedom Emergent Behavior New Phases Technologically useful functionalities?
22 QS : Quantum Devices Please provide feedback Form sent Wednesday Location: Penn State Organizers: The same Time: June 2019 Approval from NSF/DOE to have up to 1/5 returning students Please apply if interested! Update this photo for this year s school
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