47 citations · 59 across the 2 of their papers we have counts for
4 papers · 1 filter
Topological phase transitions with and without energy gap closing
Yunyou Yang, Huichao Li, L. Sheng +3
Topological phase transitions in a three-dimensional (3D) topological insulator (TI) with an exchange field of strength are studied by calculating spin Chern numbers $C^\pm(k_z…
Stabilization of Quantum Spin Hall Effect by Designed Removal of Time-Reversal Symmetry of Edge States
Huichao Li, L. Sheng, R. Shen +4
The quantum spin Hall (QSH) effect is known to be unstable to perturbations violating time-reversal symmetry. We show that creating a narrow ferromagnetic (FM) region near the edge…
A topological look at the quantum spin Hall state
Huichao Li, L. Sheng, D. Y. Xing
We propose a topological understanding of the quantum spin Hall state without considering any symmetries, and it follows from the gauge invariance that either the energy gap or the…
Quantum Hall Effect in Thin Films of Three-Dimensional Topological Insulators
Huichao Li, L. Sheng, D. Y. Xing
We show that a thin film of a three-dimensional topological insulator (3DTI) with an exchange field is a realization of the famous Haldane model for quantum Hall effect (QHE) witho…