Xue-sen Wang

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Topological insulators (TIs) are a new type of electronic materials in which the nontrivial insulating bulk band topology governs conducting boundary states with embedded spin-momentum locking. Such edge states are more robust in a two-dimensional (2D) TI against scattering by nonmagnetic impurities than in its three-dimensional (3D) variant, because in 2D(More)
Based on an inverted bulk band order, antimony thin films presumably could become topological insulators if quantum confinement effect opens up a gap in the bulk bands. Coupling between topological surface states (TSS) from opposite surfaces, however, tends to degrade or even destroy their novel characters. Here the evolution and coupling of TSS on Sb(111)(More)
We report the first-principle study on the recovery and linearization of Dirac cones in the electronic band structures of a few bilayer Sb(111) films (n-BL Sb) by surface modification. Due to the interaction between the surface states on the two surfaces of a free-standing film, the distorted Dirac cone in n-BL Sb(111) (n < 5) disappears. We demonstrate(More)
Ultra-fine Au nanoparticles (NPs) show great application potential in catalysis. Size-tunable Au NPs have been fabricated on MoS(2) covered with monolayer 3,4,5,10-perylene tetracarboxylic dianhydride (PTCDA), and the morphological evolution as a function of Au deposition amount was investigated using scanning tunneling microscopy (STM). The PTCDA molecules(More)
Yunhao Lu, 2, ∗ Di Zhou, Guoqing Chang, 4 Shan Guan, Weiguang Chen, Yinzhu Jiang, 2 Jianzhong Jiang, 2 Hsin Lin, 4, † Xue-sen Wang, Shengyuan A. Yang, ‡ Yuan Ping Feng, and Yoshiyuki Kawazoe 8 School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou(More)
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