Tuning Edge States in Strained-Layer InAs/GaInSb Quantum Spin Hall   Insulators
  We report on a class of quantum spin Hall insulators (QSHIs) in strained-layer InAs/GaInSb quantum wells, in which the bulk gaps are enhanced by up to five folds as compared to the binary InAs/GaSb QSHI. Remarkably, with consequently increasing edge velocity, the edge conductance at zero and applied magnetic fields manifests time reversal symmetry (TRS) -protected properties consistent with Z2 topological insulator. The InAs/GaInSb bilayers offer a much sought-after platform for future studies and applications of the QSHI. 
Lingjie Du, Tingxin Li, Wenkai Lou, Xingjun Wu, Xiaoxue Liu, Zhongdong   Han, Chi Zhang, Gerard Sullivan, Amal Ikhlassi, Kai...
cond-mat.mes-hall