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Ma J, Yi C, Lv B, et al. Experimental evidence of hourglass fermion in the candidate nonsymmorphic topological insulator KHgSb. Sci Adv. 2017;3(5):e1602415doi: 10.1126/sciadv.1602415.
Ma, J., Yi, C., Lv, B., Wang, Z., Nie, S., Wang, L., Kong, L., Huang, Y., Richard, P., Zhang, P., Yaji, K., Kuroda, K., Shin, S., Weng, H., Bernevig, B. A., Shi, Y., Qian, T., & Ding, H. (2017). Experimental evidence of hourglass fermion in the candidate nonsymmorphic topological insulator KHgSb. Science advances, 3(5), e1602415. https://doi.org/10.1126/sciadv.1602415
Ma, Junzhang, et al. "Experimental evidence of hourglass fermion in the candidate nonsymmorphic topological insulator KHgSb." Science advances vol. 3,5 (2017): e1602415. doi: https://doi.org/10.1126/sciadv.1602415
Ma J, Yi C, Lv B, Wang Z, Nie S, Wang L, Kong L, Huang Y, Richard P, Zhang P, Yaji K, Kuroda K, Shin S, Weng H, Bernevig BA, Shi Y, Qian T, Ding H. Experimental evidence of hourglass fermion in the candidate nonsymmorphic topological insulator KHgSb. Sci Adv. 2017 May 05;3(5):e1602415. doi: 10.1126/sciadv.1602415. eCollection 2017 May. PMID: 28508059; PMCID: PMC5419706.
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Sci Adv. 2017 May 05;3(5):e1602415. doi: 10.1126/sciadv.1602415. eCollection 2017 May.

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

Science advances

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

Affiliations

  1. Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
  2. Department of Physics, Princeton University, Princeton, NJ 08544, USA.
  3. Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China.
  4. Collaborative Innovation Center of Quantum Matter, Beijing, China.
  5. School of Physics, University of Chinese Academy of Sciences, Beijing 100190, China.
  6. Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan.

PMID: 28508059 PMCID: PMC5419706 DOI: 10.1126/sciadv.1602415

Abstract

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.

Keywords: Hourglass fermion; nonsymmorphic materials; topological insulator

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