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Title: Observation of the topological surface state in the nonsymmorphic topological insulator KHgSb

Abstract

Topological insulators represent unusual topological quantum states, typically with gapped bulk band structure but gapless surface Dirac fermions protected by time-reversal symmetry. Recently, a distinct kind of topological insulator resulting from nonsymmorphic crystalline symmetry was proposed in the KHg X ($X$ = $$\mathrm{As}$$, Sb, Bi) compounds. Unlike regular topological crystalline insulators, the nonsymmorphic glide-reflection symmetry in KHg X guarantees the appearance of an exotic surface fermion with hourglass shape dispersion (where two pairs of branches switch their partners) residing on its (010) side surface, contrasting to the usual two-dimensional Dirac fermion form. Here, by using high-resolution angle-resolved photoemission spectroscopy, we systematically investigate the electronic structures of KHgSb on both (001) and (010) surfaces and reveal the unique in-gap surface states on the (010) surface with delicate dispersion consistent with the "hourglass Fermion" recently proposed. Finally, our experiment strongly supports that KHgSb is a nonsymmorphic topological crystalline insulator with hourglass fermions, which serves as an important step to the discovery of unique topological quantum materials and exotic fermions protected by nonsymmorphic crystalline symmetry.

Authors:
 [1];  [2];  [1];  [3];  [3];  [3];  [4];  [4];  [5];  [6];  [7];  [1];  [1];  [8];  [9];  [10];  [11];  [12];  [3];  [13] more »;  [1];  [14] « less
  1. ShanghaiTech Univ., Shanghai (China). School of Physical Science and Technology
  2. ShanghaiTech Univ., Shanghai (China). School of Physical Science and Technology; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS); Pohang University of Science and Technology (POSTECH), Pohang (South Korea). Pohang Accelerator Lab.
  3. Max Planck Inst. for Chemical Physics of Solids, Dresden (Germany)
  4. Univ. of Oxford (United Kingdom). Dept. of Physics
  5. Chinese Academy of Sciences (CAS), Shanghai (China). State Key Lab. for Functional Materials for Informatics
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS); Tsinghua Univ., Beijing (China). Dept. of Physics and Collaborative Innovation Center for Quantum Matter, State Key Lab. of Low Dimensional Quantum Physics
  7. ShanghaiTech Univ., Shanghai (China). School of Physical Science and Technology; Chinese Academy of Sciences (CAS), Shanghai (China). State Key Lab. for Functional Materials for Informatics
  8. ShanghaiTech Univ., Shanghai (China). School of Physical Science and Technology; Max Planck Inst. for Chemical Physics of Solids, Dresden (Germany)
  9. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  10. Chines Academy of Sciences (CAS), Beijing (China). Inst. of Physics, Beijing National Lab. for Condensed Matter Physics
  11. Chines Academy of Sciences (CAS), Beijing (China). Inst. of Physics, Beijing National Lab. for Condensed Matter Physics; Collaborative Innovation Center of Quantum Matter, Beijing (China)
  12. Tsinghua Univ., Beijing (China). Dept. of Physics and Collaborative Innovation Center for Quantum Matter, State Key Lab. of Low Dimensional Quantum Physics
  13. Weizmann Inst. of Science, Rehovot (Israel). Dept. of Condensed Matter Physics
  14. ShanghaiTech Univ., Shanghai (China). School of Physical Science and Technology; Univ. of Oxford (United Kingdom). Dept. of Physics; Tsinghua Univ., Beijing (China). Dept. of Physics and Collaborative Innovation Center for Quantum Matter, State Key Lab. of Low Dimensional Quantum Physics; Univ. of Science and Technology of China, Hefei (China). Hefei Science Center
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division
OSTI Identifier:
1571088
Alternate Identifier(s):
OSTI ID: 1404743
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 16; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Liang, A. J., Jiang, J., Wang, M. X., Sun, Y., Kumar, N., Shekhar, C., Chen, C., Peng, H., Wang, C. W., Xu, X., Yang, H. F., Cui, S. T., Hong, G. H., Xia, Y. -Y., Mo, S. -K., Gao, Q., Zhou, X. J., Yang, L. X., Felser, C., Yan, B. H., Liu, Z. K., and Chen, Y. L. Observation of the topological surface state in the nonsymmorphic topological insulator KHgSb. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.96.165143.
Liang, A. J., Jiang, J., Wang, M. X., Sun, Y., Kumar, N., Shekhar, C., Chen, C., Peng, H., Wang, C. W., Xu, X., Yang, H. F., Cui, S. T., Hong, G. H., Xia, Y. -Y., Mo, S. -K., Gao, Q., Zhou, X. J., Yang, L. X., Felser, C., Yan, B. H., Liu, Z. K., & Chen, Y. L. Observation of the topological surface state in the nonsymmorphic topological insulator KHgSb. United States. doi:10.1103/PhysRevB.96.165143.
Liang, A. J., Jiang, J., Wang, M. X., Sun, Y., Kumar, N., Shekhar, C., Chen, C., Peng, H., Wang, C. W., Xu, X., Yang, H. F., Cui, S. T., Hong, G. H., Xia, Y. -Y., Mo, S. -K., Gao, Q., Zhou, X. J., Yang, L. X., Felser, C., Yan, B. H., Liu, Z. K., and Chen, Y. L. Wed . "Observation of the topological surface state in the nonsymmorphic topological insulator KHgSb". United States. doi:10.1103/PhysRevB.96.165143. https://www.osti.gov/servlets/purl/1571088.
@article{osti_1571088,
title = {Observation of the topological surface state in the nonsymmorphic topological insulator KHgSb},
author = {Liang, A. J. and Jiang, J. and Wang, M. X. and Sun, Y. and Kumar, N. and Shekhar, C. and Chen, C. and Peng, H. and Wang, C. W. and Xu, X. and Yang, H. F. and Cui, S. T. and Hong, G. H. and Xia, Y. -Y. and Mo, S. -K. and Gao, Q. and Zhou, X. J. and Yang, L. X. and Felser, C. and Yan, B. H. and Liu, Z. K. and Chen, Y. L.},
abstractNote = {Topological insulators represent unusual topological quantum states, typically with gapped bulk band structure but gapless surface Dirac fermions protected by time-reversal symmetry. Recently, a distinct kind of topological insulator resulting from nonsymmorphic crystalline symmetry was proposed in the KHgX ($X$ = $\mathrm{As}$, Sb, Bi) compounds. Unlike regular topological crystalline insulators, the nonsymmorphic glide-reflection symmetry in KHgX guarantees the appearance of an exotic surface fermion with hourglass shape dispersion (where two pairs of branches switch their partners) residing on its (010) side surface, contrasting to the usual two-dimensional Dirac fermion form. Here, by using high-resolution angle-resolved photoemission spectroscopy, we systematically investigate the electronic structures of KHgSb on both (001) and (010) surfaces and reveal the unique in-gap surface states on the (010) surface with delicate dispersion consistent with the "hourglass Fermion" recently proposed. Finally, our experiment strongly supports that KHgSb is a nonsymmorphic topological crystalline insulator with hourglass fermions, which serves as an important step to the discovery of unique topological quantum materials and exotic fermions protected by nonsymmorphic crystalline symmetry.},
doi = {10.1103/PhysRevB.96.165143},
journal = {Physical Review B},
number = 16,
volume = 96,
place = {United States},
year = {2017},
month = {10}
}

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