Two-Dimensional Second-Order Topological Insulator in Graphdiyne

Xian-Lei Sheng, Cong Chen, Huiying Liu, Ziyu Chen, Zhi-Ming Yu, Y. X. Zhao, and Shengyuan A. Yang
Phys. Rev. Lett. 123, 256402 – Published 18 December 2019
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Abstract

A second-order topological insulator (SOTI) in d spatial dimensions features topologically protected gapless states at its (d2)-dimensional boundary at the intersection of two crystal faces, but is gapped otherwise. As a novel topological state, it has been attracting great interest, but it remains a challenge to identify a realistic SOTI material in two dimensions (2D). Here, based on combined first-principles calculations and theoretical analysis, we reveal the already experimentally synthesized 2D material graphdiyne as the first realistic example of a 2D SOTI, with topologically protected 0D corner states. The role of crystalline symmetry, the robustness against symmetry breaking, and the possible experimental characterization are discussed. Our results uncover a hidden topological character of graphdiyne and promote it as a concrete material platform for exploring the intriguing physics of higher-order topological phases.

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  • Received 29 April 2019

DOI:https://doi.org/10.1103/PhysRevLett.123.256402

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Xian-Lei Sheng1,2,*,†, Cong Chen1,2,*, Huiying Liu2, Ziyu Chen1, Zhi-Ming Yu2,3,‡, Y. X. Zhao4,5,§, and Shengyuan A. Yang2

  • 1School of Physics, and Key Laboratory of Micro-nano Measurement-Manipulation and Physics, Beihang University, Beijing 100191, China
  • 2Research Laboratory for Quantum Materials, Singapore University of Technology and Design, Singapore 487372, Singapore
  • 3Key Lab of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), Beijing Key Lab of Nanophotonics & Ultrafine Optoelectronic Systems, and School of Physics, Beijing Institute of Technology, Beijing 100081, China
  • 4National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China
  • 5Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China

  • *X.-L. Sheng and C. Chen contributed equally to this work.
  • xlsheng@buaa.edu.cn
  • zhiming_yu@sutd.edu.sg
  • §zhaoyx@nju.edu.cn

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Issue

Vol. 123, Iss. 25 — 20 December 2019

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