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

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.

doi:10.1103/PhysRevB.96.165143

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

Journal Article · Wed Oct 25 00:00:00 EDT 2017 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.96.165143· OSTI ID:1571088

Liang, A. J. ^[1]; Jiang, J. ^[2]; Wang, M. X. ^[1]; Sun, Y. ^[3]; Kumar, N. ^[3]; Shekhar, C. ^[3]; Chen, C. ^[4]; Peng, H. ^[4]; Wang, C. W. ^[5]; Xu, X. ^[6]; Yang, H. F. ^[7]; Cui, S. T. ^[1]; Hong, G. H. ^[1]; Xia, Y. -Y. ^[8]; Mo, S. -K. ^[9]; Gao, Q. ^[10]; Zhou, X. J. ^[11]; Yang, L. X. ^[12]; Felser, C. ^[3]; Yan, B. H. ^[13] more »

ShanghaiTech Univ., Shanghai (China). School of Physical Science and Technology
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.
Max Planck Inst. for Chemical Physics of Solids, Dresden (Germany)
Univ. of Oxford (United Kingdom). Dept. of Physics
Chinese Academy of Sciences (CAS), Shanghai (China). State Key Lab. for Functional Materials for Informatics
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
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
ShanghaiTech Univ., Shanghai (China). School of Physical Science and Technology; Max Planck Inst. for Chemical Physics of Solids, Dresden (Germany)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Chines Academy of Sciences (CAS), Beijing (China). Inst. of Physics, Beijing National Lab. for Condensed Matter Physics
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)
Tsinghua Univ., Beijing (China). Dept. of Physics and Collaborative Innovation Center for Quantum Matter, State Key Lab. of Low Dimensional Quantum Physics
Weizmann Inst. of Science, Rehovot (Israel). Dept. of Condensed Matter Physics
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

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.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1571088

Alternate ID(s):: OSTI ID: 1404743

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 16 Vol. 96; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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