Experimental evidence of hourglass fermion in the candidate nonsymmorphic topological insulator KHgSb

Ma, Junzhang; Yi, Changjiang; Lv, Baiqing; Wang, ZhiJun; Nie, Simin; Wang, Le; Kong, Lingyuan; Huang, Yaobo; Richard, Pierre; Zhang, Peng; Yaji, Koichiro; Kuroda, Kenta; Shin, Shik; Weng, Hongming; Bernevig, Bogdan Andrei; Shi, Youguo; Qian, Tian; Ding, Hong

doi:10.1126/sciadv.1602415

Title: Experimental evidence of hourglass fermion in the candidate nonsymmorphic topological insulator KHgSb

Journal Article · Fri May 05 00:00:00 EDT 2017 · Science Advances

DOI:https://doi.org/10.1126/sciadv.1602415· OSTI ID:1426779

Ma, Junzhang ^[1]; Yi, Changjiang ^[1]; Lv, Baiqing ^[1];

^[2]; Nie, Simin ^[1]; Wang, Le ^[1]; Kong, Lingyuan ^[1];

^[1];

^[3]; Zhang, Peng ^[4]; Yaji, Koichiro ^[4]; Kuroda, Kenta ^[4];

^[4];

^[5]; Bernevig, Bogdan Andrei ^[2]; Shi, Youguo ^[1]; Qian, Tian ^[5];

^[3]

Chinese Academy of Sciences (CAS), Beijing (China)
Princeton Univ., NJ (United States)
Chinese Academy of Sciences (CAS), Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China)
Univ. of Tokyo (Japan)
Chinese Academy of Sciences (CAS), Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)

Topological insulators (TIs) host novel states of quantum matter characterized by nontrivial conducting boundary states connecting valence and conduction bulk bands. All TIs discovered experimentally so far rely on either time-reversal or mirror crystal symmorphic symmetry to protect massless Dirac-like boundary states. Several materials were recently proposed to be TIs with nonsymmorphic symmetry, where a glide mirror protects exotic surface fermions with hourglass-shaped dispersion. However, an experimental confirmation of this new fermion is missing. Using angle-resolved photoemission spectroscopy, we provide experimental evidence of hourglass fermions on the (010) surface of crystalline KHgSb, whereas the (001) surface has no boundary state, in agreement with first-principles calculations. Our study will stimulate further research activities of topological properties of nonsymmorphic materials.

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Research Organization:: Princeton Univ., NJ (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: sC0016239

OSTI ID:: 1426779

Journal Information:: Science Advances, Vol. 3, Issue 5; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 71 works

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