106年9月23日星期六

演講:Tunable topological electronic structures in Sb(111) bilayers: A first-principles study--5/29(三)14:30-16:302013/05/24

國家高速網路與計算中心邀請演講

講 題: Tunable topological electronic structures in Sb(111) bilayers: A first-principles study
講 者: Professor Feng-Chuan Chuang, Department of Physics, National Sun Yat-sen University
時 間:102 年 05 月 29 日(三)上午14:30-16:30
地 點:(1) 台中分部 台中市中部科學工業園區科園路22號 TC215會議室(現場)
(2) 台南分部 台南市新市區南科三路28號 台南國際會議廳 (視訊)
(3) 新竹分部 新竹市科學園區研發六路7號 國際會議廳 (視訊)
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NCHC Seminar
Title: Tunable topological electronic structures in Sb(111) bilayers: A first-principles study
Speaker: Professor Feng-Chuan Chuang, Department of Physics, National Sun Yat-sen University
Time:14:30-16:30, 102 /05/ 29 (Wednesday)
Place:(1) Taichung Branch, Meeting room TC215 (No. 22, Keyuan Rd., Central Taiwan Science Park, Taichung City) (live presentation)
(2) Tainan Branch, International Conference Hall (No. 28, Nan-Ke 3rd Rd., Hsin-Shi Dist., Tainan City) (live video)
(3) Hsinchu Headquarters, International Conference Hall (No. 7, R&D 6th Rd., Hsinchu Science Park, Hsinchu City) (live video)
Abstract:Electronic structure and band topology of a single Sb(111) bilayer in the buckled honeycomb configuration are investigated using first-principles calculations with the inclusion of spin-orbit coupling. While a trivial band insulator is predicted for the free-standing thin film, a band inversion at the Brillouin zone center can be induced by tensile strain, resulting in a topological insulator with a nontrivial topological invariant Z2 = 1. Our study points at the possibility of realizing the quantum spin Hall state for an Sb(111) single bilayer on a suitable substrate. Moreover, the presence of buckling provides an advantage in controlling the band gap through an out-of-plane external electric field, which breaks the inversion symmetry and lifts the spin degeneracy. A topological phase transition driven by gating is demonstrated, and six spin-polarized Dirac cones are found at the critical point. With a tunable gap and reversible spin polarization, Sb thin films are promising candidates for spintronic applications.
Everyone is welcome.
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