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国家自然科学基金(11074110)

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发文基金:国家自然科学基金国家重点基础研究发展计划更多>>
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Spin Chern numbers and time-reversal-symmetry-broken quantum spin Hall effect
2013年
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.
盛利李会超杨运友盛冬宁邢定钰
Coupling-matrix approach to the Chern number calculation in disordered systems
2013年
The Chern number is often used to distinguish different topological phases of matter in two-dimensional electron systems. A fast and efficient coupling-matrix method is designed to calculate the Chern number in finite crystalline and disordered systems. To show its effectiveness, we apply the approach to the Haldane model and the lattice Hofstadter model, and obtain the correct quantized Chern numbers. The disorder-induced topological phase transition is well reproduced, when the disorder strength is increased beyond the critical value. We expect the method to be widely applicable to the study of topological quantum numbers.
张议夫杨运友鞠艳盛利沈瑞盛冬宁邢定钰
关键词:TOPOLOGYDISORDER
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