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Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
B. Andrei Bernevig, Taylor L. Hughes, Shou-Cheng Zhang
We show that the Quantum Spin Hall Effect, a state of matter with topological properties distinct from conventional insulators, can be realized in HgTe/CdTe semiconductor quantum w…
Non-diffusive spin dynamics in a two-dimensional electron gas
C. P. Weber, J. Orenstein, B. Andrei Bernevig +3
We describe measurements of spin dynamics in the two-dimensional electron gas in GaAs/GaAlAs quantum wells. Optical techniques, including transient spin-grating spectroscopy, are u…
Fermi liquid instabilities in the spin channel
Congjun Wu, Kai Sun, Eduardo Fradkin +1
We study the Fermi surface instabilities of the Pomeranchuk type in the spin triplet channel with high orbital partial waves (). The ordered phases are classified i…
Band Collapse and the Quantum Hall Effect in Graphene
B. Andrei Bernevig, Taylor L. Hughes, Han-Dong Chen +2
The recent Quantum Hall experiments in graphene have confirmed the theoretically well-understood picture of the quantum Hall (QH) conductance in fermion systems with continuum Dira…
Spin-orbit gap of graphene: First-principles calculations
Yugui Yao, Fei Ye, Xiao-Liang Qi +2
Even though graphene is a low energy system consisting of the two dimensional honeycomb lattice of carbon atoms, its quasi-particle excitations are fully described by the 2+1 dimen…
A General Theorem Relating the Bulk Topological Number to Edge States in Two-dimensional Insulators
Xiao-Liang Qi, Yong-Shi Wu, Shou-Cheng Zhang
We prove a general theorem on the relation between the bulk topological quantum number and the edge states in two dimensional insulators. It is shown that whenever there is a topol…