Symmetry Dictated Grain Boundary State in a Two-Dimensional Topological Insulator
- Authors
- Kim, Hyo Won; Kang, Seoung-Hun; Kim, Hyun-Jung; Chae, Kisung; Cho, Suyeon; Ko, Wonhee; Jeon, Sangjun; Kang, Se Hwang; Yang, Heejun; Kim, Sung Wng; Park, Seongjun; Hwang, Sungwoo; Kwon, Young-Kyun; Son, Young-Woo
- Issue Date
- Aug-2020
- Publisher
- American Chemical Society
- Keywords
- density functional theory calculations; Grain boundary; nonsymmorphic symmetry; scanning tunneling microscopy; topological insulator; Weyl semimetallic states
- Citation
- Nano Letters, v.20, no.8, pp 5837 - 5843
- Pages
- 7
- Journal Title
- Nano Letters
- Volume
- 20
- Number
- 8
- Start Page
- 5837
- End Page
- 5843
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/53424
- DOI
- 10.1021/acs.nanolett.0c01756
- ISSN
- 1530-6984
1530-6992
- Abstract
- 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. © 2020 American Chemical Society.
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