Inherited weak topological insulator signatures in the topological hourglass semimetal Nb3XTe6 (X=Si, Ge) INHERITED WEAK TOPOLOGICAL INSULATOR ... Q. WAN et al.

Q. Wan; T. Y. Yang; S. Li; M. Yang; Z. Zhu; C. L. Wu; C. Peng; S. K. Mo; W. Wu; Z. H. Chen; Y. B. Huang; L. L. Lev; V. N. Strocov; J. Hu; Z. Q. Mao; Hao Zheng; J. F. Jia; Y. G. Shi; Shengyuan A. Yang; N. Xu

doi:10.1103/PhysRevB.103.165107

Inherited weak topological insulator signatures in the topological hourglass semimetal Nb3XTe6 (X=Si, Ge) INHERITED WEAK TOPOLOGICAL INSULATOR ... Q. WAN et al.

Q. Wan, T. Y. Yang, S. Li, M. Yang, Z. Zhu, C. L. Wu, C. Peng, S. K. Mo, W. Wu, Z. H. Chen, Y. B. Huang, L. L. Lev, V. N. Strocov, J. Hu, Z. Q. Mao, Hao Zheng, J. F. Jia, Y. G. Shi, Shengyuan A. Yang, N. Xu

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Abstract

Using spin-resolved and angle-resolved photoemission spectroscopy and first-principles calculations, we have identified bulk band inversion and the spin-polarized surface state evolved from a weak topological insulator (TI) phase in van der Waals materials Nb3XTe6 (X=Si, Ge). The fingerprints of weak TIs homologically emerge with hourglass fermions as multinodal chains composed by the same pair of valence and conduction bands gapped by spin-orbit coupling. The unique topological state, with a pair of valence and conduction bands encoding both weak TI and hourglass semimetal nature, is essential and guaranteed by nonsymmorphic symmetry. It is distinct from TIs studied previously based on band inversions without symmetry protections.

Original language	English (US)
Article number	165107
Journal	Physical Review B
Volume	103
Issue number	16
DOIs	https://doi.org/10.1103/PhysRevB.103.165107
State	Published - Apr 6 2021

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.103.165107

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Wan, Q., Yang, T. Y., Li, S., Yang, M., Zhu, Z., Wu, C. L., Peng, C., Mo, S. K., Wu, W., Chen, Z. H., Huang, Y. B., Lev, L. L., Strocov, V. N., Hu, J., Mao, Z. Q., Zheng, H., Jia, J. F., Shi, Y. G., Yang, S. A., & Xu, N. (2021). Inherited weak topological insulator signatures in the topological hourglass semimetal Nb3XTe6 (X=Si, Ge) INHERITED WEAK TOPOLOGICAL INSULATOR ... Q. WAN et al. Physical Review B, 103(16), Article 165107. https://doi.org/10.1103/PhysRevB.103.165107

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title = "Inherited weak topological insulator signatures in the topological hourglass semimetal Nb3XTe6 (X=Si, Ge) INHERITED WEAK TOPOLOGICAL INSULATOR ... Q. WAN et al.",

abstract = "Using spin-resolved and angle-resolved photoemission spectroscopy and first-principles calculations, we have identified bulk band inversion and the spin-polarized surface state evolved from a weak topological insulator (TI) phase in van der Waals materials Nb3XTe6 (X=Si, Ge). The fingerprints of weak TIs homologically emerge with hourglass fermions as multinodal chains composed by the same pair of valence and conduction bands gapped by spin-orbit coupling. The unique topological state, with a pair of valence and conduction bands encoding both weak TI and hourglass semimetal nature, is essential and guaranteed by nonsymmorphic symmetry. It is distinct from TIs studied previously based on band inversions without symmetry protections.",

author = "Q. Wan and Yang, {T. Y.} and S. Li and M. Yang and Z. Zhu and Wu, {C. L.} and C. Peng and Mo, {S. K.} and W. Wu and Chen, {Z. H.} and Huang, {Y. B.} and Lev, {L. L.} and Strocov, {V. N.} and J. Hu and Mao, {Z. Q.} and Hao Zheng and Jia, {J. F.} and Shi, {Y. G.} and Yang, {Shengyuan A.} and N. Xu",

note = "Publisher Copyright: {\textcopyright} 2021 American Physical Society.",

year = "2021",

month = apr,

day = "6",

doi = "10.1103/PhysRevB.103.165107",

language = "English (US)",

volume = "103",

journal = "Physical Review B",

issn = "2469-9950",

publisher = "American Physical Society",

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Wan, Q, Yang, TY, Li, S, Yang, M, Zhu, Z, Wu, CL, Peng, C, Mo, SK, Wu, W, Chen, ZH, Huang, YB, Lev, LL, Strocov, VN, Hu, J, Mao, ZQ, Zheng, H, Jia, JF, Shi, YG, Yang, SA & Xu, N 2021, 'Inherited weak topological insulator signatures in the topological hourglass semimetal Nb3XTe6 (X=Si, Ge) INHERITED WEAK TOPOLOGICAL INSULATOR ... Q. WAN et al.', Physical Review B, vol. 103, no. 16, 165107. https://doi.org/10.1103/PhysRevB.103.165107

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AU - Wan, Q.

AU - Yang, T. Y.

AU - Li, S.

AU - Yang, M.

AU - Zhu, Z.

AU - Wu, C. L.

AU - Peng, C.

AU - Mo, S. K.

AU - Wu, W.

AU - Chen, Z. H.

AU - Huang, Y. B.

AU - Lev, L. L.

AU - Strocov, V. N.

AU - Hu, J.

AU - Mao, Z. Q.

AU - Zheng, Hao

AU - Jia, J. F.

AU - Shi, Y. G.

AU - Yang, Shengyuan A.

AU - Xu, N.

PY - 2021/4/6

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N2 - Using spin-resolved and angle-resolved photoemission spectroscopy and first-principles calculations, we have identified bulk band inversion and the spin-polarized surface state evolved from a weak topological insulator (TI) phase in van der Waals materials Nb3XTe6 (X=Si, Ge). The fingerprints of weak TIs homologically emerge with hourglass fermions as multinodal chains composed by the same pair of valence and conduction bands gapped by spin-orbit coupling. The unique topological state, with a pair of valence and conduction bands encoding both weak TI and hourglass semimetal nature, is essential and guaranteed by nonsymmorphic symmetry. It is distinct from TIs studied previously based on band inversions without symmetry protections.

AB - Using spin-resolved and angle-resolved photoemission spectroscopy and first-principles calculations, we have identified bulk band inversion and the spin-polarized surface state evolved from a weak topological insulator (TI) phase in van der Waals materials Nb3XTe6 (X=Si, Ge). The fingerprints of weak TIs homologically emerge with hourglass fermions as multinodal chains composed by the same pair of valence and conduction bands gapped by spin-orbit coupling. The unique topological state, with a pair of valence and conduction bands encoding both weak TI and hourglass semimetal nature, is essential and guaranteed by nonsymmorphic symmetry. It is distinct from TIs studied previously based on band inversions without symmetry protections.

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Inherited weak topological insulator signatures in the topological hourglass semimetal Nb3XTe6 (X=Si, Ge) INHERITED WEAK TOPOLOGICAL INSULATOR ... Q. WAN et al.

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