Stable two-dimensional dumbbell stanene: A quantum spin Hall insulator

Peizhe Tang, 2 Pengcheng Chen, Wendong Cao, Huaqing Huang, Seymur Cahangirov, Lede Xian, Yong Xu, 4 Shou-Cheng Zhang, 4 Wenhui Duan, 4, 5, ∗ and Angel Rubio † State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China Nano-Bio Spectroscopy group, Dpto. F́ısica de Materiales, Universidad del Páıs Vasco, Centro de F́ısica de Materiales CSIC-UPV/EHU-MPC and DIPC, Av. Tolosa 72, E-20018 San Sebastián, Spain Department of Physics, McCullough Building, Stanford University, Stanford, California 94305-4045, USA Institute for Advanced Study, Tsinghua University, Beijing 100084, People’s Republic of China Collaborative Innovation Center of Quantum Matter, Beijing 100084, China (Dated: July 9, 2014)