Dirac Nodal Line in Hourglass Semimetal Nb3SiTe6

Ro Ya Liu; Angus Huang; Raman Sankar; Joseph Andrew Hlevyack; Chih Chuan Su; Shih Chang Weng; Meng Kai Lin; Peng Chen; Cheng Maw Cheng; Jonathan D. Denlinger; Sung Kwan Mo; Alexei V. Fedorov; Chia Seng Chang; Horng Tay Jeng; Tien Ming Chuang; Tai Chang Chiang

doi:10.1021/acs.nanolett.2c03293

Dirac Nodal Line in Hourglass Semimetal Nb₃SiTe₆

Ro Ya Liu, Angus Huang, Raman Sankar, Joseph Andrew Hlevyack, Chih Chuan Su, Shih Chang Weng, Meng Kai Lin, Peng Chen, Cheng Maw Cheng, Jonathan D. Denlinger, Sung Kwan Mo, Alexei V. Fedorov, Chia Seng Chang, Horng Tay Jeng, Tien Ming Chuang, Tai Chang Chiang

Department of Physics

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

Glide-mirror symmetry in nonsymmorphic crystals can foster the emergence of novel hourglass nodal loop states. Here, we present spectroscopic signatures from angle-resolved photoemission of a predicted topological hourglass semimetal phase in Nb₃SiTe₆. Linear band crossings are observed at the zone boundary of Nb₃SiTe₆, which could be the origin of the nontrivial Berry phase and are consistent with a predicted glide quantum spin Hall effect; such linear band crossings connect to form a nodal loop. Furthermore, the saddle-like Fermi surface of Nb₃SiTe₆observed in our results helps unveil linear band crossings that could be missed. In situ alkali-metal doping of Nb₃SiTe₆also facilitated the observation of other band crossings and parabolic bands at the zone center correlated with accidental nodal loop states.

Original language	English
Pages (from-to)	380-388
Number of pages	9
Journal	Nano Letters
Volume	23
Issue number	1
DOIs	https://doi.org/10.1021/acs.nanolett.2c03293
State	Published - 11 Jan 2023

Keywords

Dirac nodal loop
first-principles band structures
glide-mirror symmetry
hourglass fermions
nonsymmorphic crystals
photoemission

Access to Document

10.1021/acs.nanolett.2c03293

Cite this

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title = "Dirac Nodal Line in Hourglass Semimetal Nb3SiTe6",

abstract = "Glide-mirror symmetry in nonsymmorphic crystals can foster the emergence of novel hourglass nodal loop states. Here, we present spectroscopic signatures from angle-resolved photoemission of a predicted topological hourglass semimetal phase in Nb3SiTe6. Linear band crossings are observed at the zone boundary of Nb3SiTe6, which could be the origin of the nontrivial Berry phase and are consistent with a predicted glide quantum spin Hall effect; such linear band crossings connect to form a nodal loop. Furthermore, the saddle-like Fermi surface of Nb3SiTe6observed in our results helps unveil linear band crossings that could be missed. In situ alkali-metal doping of Nb3SiTe6also facilitated the observation of other band crossings and parabolic bands at the zone center correlated with accidental nodal loop states.",

keywords = "Dirac nodal loop, first-principles band structures, glide-mirror symmetry, hourglass fermions, nonsymmorphic crystals, photoemission",

author = "Liu, {Ro Ya} and Angus Huang and Raman Sankar and Hlevyack, {Joseph Andrew} and Su, {Chih Chuan} and Weng, {Shih Chang} and Lin, {Meng Kai} and Peng Chen and Cheng, {Cheng Maw} and Denlinger, {Jonathan D.} and Mo, {Sung Kwan} and Fedorov, {Alexei V.} and Chang, {Chia Seng} and Jeng, {Horng Tay} and Chuang, {Tien Ming} and Chiang, {Tai Chang}",

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doi = "10.1021/acs.nanolett.2c03293",

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T1 - Dirac Nodal Line in Hourglass Semimetal Nb3SiTe6

AU - Liu, Ro Ya

AU - Huang, Angus

AU - Sankar, Raman

AU - Hlevyack, Joseph Andrew

AU - Su, Chih Chuan

AU - Weng, Shih Chang

AU - Lin, Meng Kai

AU - Chen, Peng

AU - Cheng, Cheng Maw

AU - Denlinger, Jonathan D.

AU - Mo, Sung Kwan

AU - Fedorov, Alexei V.

AU - Chang, Chia Seng

AU - Jeng, Horng Tay

AU - Chuang, Tien Ming

AU - Chiang, Tai Chang

PY - 2023/1/11

Y1 - 2023/1/11

N2 - Glide-mirror symmetry in nonsymmorphic crystals can foster the emergence of novel hourglass nodal loop states. Here, we present spectroscopic signatures from angle-resolved photoemission of a predicted topological hourglass semimetal phase in Nb3SiTe6. Linear band crossings are observed at the zone boundary of Nb3SiTe6, which could be the origin of the nontrivial Berry phase and are consistent with a predicted glide quantum spin Hall effect; such linear band crossings connect to form a nodal loop. Furthermore, the saddle-like Fermi surface of Nb3SiTe6observed in our results helps unveil linear band crossings that could be missed. In situ alkali-metal doping of Nb3SiTe6also facilitated the observation of other band crossings and parabolic bands at the zone center correlated with accidental nodal loop states.

AB - Glide-mirror symmetry in nonsymmorphic crystals can foster the emergence of novel hourglass nodal loop states. Here, we present spectroscopic signatures from angle-resolved photoemission of a predicted topological hourglass semimetal phase in Nb3SiTe6. Linear band crossings are observed at the zone boundary of Nb3SiTe6, which could be the origin of the nontrivial Berry phase and are consistent with a predicted glide quantum spin Hall effect; such linear band crossings connect to form a nodal loop. Furthermore, the saddle-like Fermi surface of Nb3SiTe6observed in our results helps unveil linear band crossings that could be missed. In situ alkali-metal doping of Nb3SiTe6also facilitated the observation of other band crossings and parabolic bands at the zone center correlated with accidental nodal loop states.

KW - Dirac nodal loop

KW - first-principles band structures

KW - glide-mirror symmetry

KW - hourglass fermions

KW - nonsymmorphic crystals

KW - photoemission

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U2 - 10.1021/acs.nanolett.2c03293

DO - 10.1021/acs.nanolett.2c03293

M3 - 期刊論文

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JO - Nano Letters

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