Spin Chern numbers and time-reversal-symmetry-broken quantum spin Hall effect |
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| Institution: | [1]National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China [2]Department of Physics and Astronomy, California State University, Northndge, California 91330, USA |
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| Abstract: | The quantum spin Hall(QSH) effect is considered to be unstable to perturbations violating the time-reversal(TR) symmetry.We review some recent developments in the search of the QSH effect in the absence of the TR symmetry.The possibility to realize a robust QSH effect by artificial removal of the TR symmetry of the edge states is explored.As a useful tool to characterize topological phases without the TR symmetry,the spin-Chern number theory is introduced. |
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| Keywords: | spin-polarized transport quantum spin Hall effect surface state edge state topological insulator |
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