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  • Letter

Evidence of a topological edge state in a superconducting nonsymmorphic nodal-line semimetal

L. X. Xu1,2,3,*, Y. Y. Y. Xia1,4,*, S. Liu1,3,5,*, Y. W. Li1, L.Y. Wei1, H. Y. Wang1, C. W. Wang1,2,3, H. F. Yang1, A. J. Liang1 et al.

K. Huang1, T. Deng1,2,3, W. Xia1,4, X. Zhang1, H. J. Zheng1, Y. J. Chen6, L. X. Yang6, M. X. Wang1, Y. F. Guo1,4,†, G. Li1,4,‡, Z. K. Liu1,4,§, and Y. L. Chen1,4,6,7

  • 1School of Physical Science and Technology, ShanghaiTech University, CAS-Shanghai Science Research Center, Shanghai 200031, China
  • 2State Key Laboratory of Functional Material for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
  • 3University of Chinese Academy of Sciences, Beijing 100049, China
  • 4ShanghaiTech Laboratory for Topological Physics, Shanghai 201210, China
  • 5Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
  • 6State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
  • 7Department of Physics, University of Oxford, Oxford OX1 3PU, United Kingdom

  • *These authors contributed equally to this work.
  • †guoyf@shanghaitech.edu.cn
  • ‡ligang@shanghaitech.edu.cn
  • §liuzhk@shanghaitech.edu.cn
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Phys. Rev. B 103, L201109 – Published 13 May, 2021

DOI: https://doi.org/10.1103/PhysRevB.103.L201109

Abstract

Topological materials host fascinating low dimensional gapless states at the boundary. As a prominent example, helical topological edge states (TESs) of two-dimensional topological insulators and their stacked three-dimensional equivalent, weak topological insulators (WTIs), have sparked research enthusiasm due to their potential application in the next generation of electronics/spintronics with low dissipation. Here, we propose the layered superconducting material CaSn as a WTI with nontrivial Z2 as well as nodal-line semimetal protected by crystalline nonsymmorphic symmetry. Our systematic angle-resolved photoemission spectroscopy (ARPES) investigation on the electronic structure exhibits excellent agreement with the calculation. Furthermore, scanning tunneling microscopy/spectroscopy (STM/STS) at the surface step edge shows signatures of the expected TES. These integrated evidences from ARPES, STM/STS measurement, and corresponding ab initio calculation strongly support the existence of TES in the nonsymmorphic nodal-line semimetal CaSn, which may become a versatile material platform to realize multiple exotic electronic states as well as topological superconductivity.

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Phys. Rev. B 103, L201109– Published 13 May, 2021
  • Received 11 December 2020
  • Accepted 27 April 2021
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