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

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

doi:10.1126/sciadv.1602415

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

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

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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.

Original language	English (US)
Article number	e1602415
Journal	Science Advances
Volume	3
Issue number	5
DOIs	https://doi.org/10.1126/sciadv.1602415
State	Published - May 2017

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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), Article e1602415. https://doi.org/10.1126/sciadv.1602415

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title = "Experimental evidence of hourglass fermion in the candidate nonsymmorphic topological insulator KHgSb",

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.",

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

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year = "2017",

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doi = "10.1126/sciadv.1602415",

language = "English (US)",

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T1 - Experimental evidence of hourglass fermion in the candidate nonsymmorphic topological insulator KHgSb

AU - Ma, Junzhang

AU - Yi, Changjiang

AU - Lv, Baiqing

AU - Wang, Zhijun

AU - Nie, Simin

AU - Wang, Le

AU - Kong, Lingyuan

AU - Huang, Yaobo

AU - Richard, Pierre

AU - Zhang, Peng

AU - Yaji, Koichiro

AU - Kuroda, Kenta

AU - Shin, Shik

AU - Weng, Hongming

AU - Bernevig, Bogdan Andrei

AU - Shi, Youguo

AU - Qian, Tian

AU - Ding, Hong

PY - 2017/5

Y1 - 2017/5

N2 - 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.

AB - 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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JO - Science Advances

JF - Science Advances

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

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