Symmetry Dictated Grain Boundary State in a Two-Dimensional Topological Insulator
- 주제(키워드) Grain boundary , topological insulator , nonsymmorphic symmetry , Weyl semimetallic states , scanning tunneling microscopy , density functional theory calculations
- 주제(기타) Chemistry, Multidisciplinary
- 주제(기타) Chemistry, Physical
- 주제(기타) Nanoscience & Nanotechnology
- 주제(기타) Materials Science, Multidisciplinary
- 주제(기타) Physics, Applied
- 주제(기타) Physics, Condensed Matter
- 설명문(일반) [Kim, Hyo Won; Ko, Wonhee; Park, Seongjun; Hwang, Sungwoo] Samsung Adv Inst Technol, Suwon 13595, South Korea; [Kang, Seoung-Hun; Kim, Hyun-Jung; Chae, Kisung; Kwon, Young-Kyun; Son, Young-Woo] Korea Inst Adv Study, Seoul 02455, South Korea; [Cho, Suyeon] Ewha Womans Univ, Div Chem Engn & Mat Sci, Seoul 03760, South Korea; [Ko, Wonhee] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, POB 2009, Oak Ridge, TN 37831 USA; [Jeon, Sangjun] Chung Ang Univ, Dept Phys, Seoul 06987, South Korea; [Kang, Se Hwang; Yang, Heejun; Kim, Sung Wng] Sungkyunkwan Univ, Dept Energy Sci, Suwon 440746, South Korea; [Kwon, Young-Kyun] Kyung Hee Univ, Dept Phys, Seoul 02447, South Korea; [Kwon, Young-Kyun] Kyung Hee Univ, Res Inst Basic Sci, Seoul 02447, South Korea
- 관리정보기술 faculty
- 등재 SCIE, SCOPUS
- OA유형 Green Submitted
- 발행기관 AMER CHEMICAL SOC
- 발행년도 2020
- URI http://www.dcollection.net/handler/ewha/000000174499
- 본문언어 영어
- Published As http://dx.doi.org/10.1021/acs.nanolett.0c01756
- PubMed https://pubmed.ncbi.nlm.nih.gov/32628851
초록/요약
Grain boundaries (GBs) are ubiquitous in solids and have been of central importance in understanding the nature of polycrystals. In addition to their classical roles, topological insulators (TIs) offer a chance to realize GBs hosting distinct topological states that can be controlled by their crystal symmetries. However, such roles of crystalline symmetry in two-dimensional (2D) TIs have not been definitively measured yet. Here, we present the first direct evidence of a symmetry-enforced metallic state along a GB in 1T'-MoTe2, a prototypical 2D TI. Using scanning tunneling microscopy, we show a metallic state along a GB with nonsymmorphic lattice symmetry and its absence along another boundary with symmorphic symmetry. Our atomistic simulations demonstrate in-gap Weyl semimetallic states for the former, whereas they demonstrate gapped states for the latter, explaining our observation well. The observed metallic state, tightly linked to its crystal symmetry, can be used to create a stable conducting nanowire inside TIs.
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