[논문]ARPES study of the epitaxially grown topological crystalline insulator SnTe(111)

Zhang, Yi; Liu, Zhongkai; Zhou, Bo; Kim, Yeongkwan; Yang, Lexian; Ryu, Hyejin; Hwang, Choongyu; Chen, Yulin; Hussain, Zahid; Shen, Zhi-Xun; Mo, Sung-Kwan

doi:10.1016/j.elspec.2016.10.003

[해외논문] ARPES study of the epitaxially grown topological crystalline insulator SnTe(111) 원문보기

Journal of electron spectroscopy and related phenomena, v.219, 2017년, pp.35 - 40

Zhang, Yi (National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China) , Liu, Zhongkai (School of Physical Science and Technology, ShanghaiTech University, Shanghai 200031, China) , Zhou, Bo (Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA) , Kim, Yeongkwan (Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA) , Yang, Lexian (Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA) , Ryu, Hyejin (Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA) , Hwang, Choongyu (Max Plank POSTECH Center for Complex Phase Materials, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea) , Chen, Yulin (School of Physical Science and Technology, ShanghaiTech University, Shanghai 200031, China) , Hussain, Zahid (Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA) , Shen, Zhi-Xun (Stanford Institute of Materials and Energy Sciences, SLAC Natio) , Mo, Sung-Kwan

Abstract ▼ AI-Helper

SnTe is a prototypical topological crystalline insulator, in which the gapless surface state is protected by a crystal symmetry. The hallmark of the topological properties in SnTe is the Dirac cones projected to the surfaces with mirror symmetry, stemming from the band inversion near the L points of its bulk Brillouin zone, which can be measured by angle-resolved photoemission. We have obtained the (111) surface of SnTe film by molecular beam epitaxy on BaF2(111) substrate. Photon-energy-dependence of in situ angle-resolved photoemission, covering multiple Brillouin zones in the direction perpendicular to the (111) surface, demonstrate the projected Dirac cones at the (Gamma) over bar and (M) over bar points of the surface Brillouin zone. In addition, we observe a Dirac-cone-like band structure at the Gamma point of the bulk Brillouin zone, whose Dirac energy is largely different from those at the I, and Pi points. (C) 2016 Elsevier B.V. All rights reserved.

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DOI : 10.1016/j.elspec.2016.10.003
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