Observation of dimension-crossover of a tunable 1D Dirac fermion in topological semimetal NbSixTe2
Abstract
Condensed matter systems in low dimensions exhibit emergent physics that does not exist in three dimensions. When electrons are confined to one dimension (1D), some significant electronic states appear, such as charge density wave, spin-charge separations, and Su-Schrieffer-Heeger (SSH) topological state. However, a clear understanding of how the 1D electronic properties connects with topology is currently lacking. Here we systematically investigated the characteristic 1D Dirac fermion electronic structure originated from the metallic NbTe2 chains on the surface of the composition-tunable layered compound NbSixTe2 (x = 0.40 and 0.43) using angle-resolved photoemission spectroscopy. We found the Dirac fermion forms a Dirac nodal line structure protected by the combined $$\widetilde {M_y}$$ and time-reversal symmetry T and proves the NbSixTe2 system as a topological semimetal, in consistent with the ab-initio calculations. As x decreases, the interaction between adjacent NbTe2 chains increases and Dirac fermion goes through a dimension-crossover from 1D to 2D, as evidenced by the variation of its Fermi surface and Fermi velocity across the Brillouin zone in consistence with a Dirac SSH model. Our findings demonstrate a tunable 1D Dirac electron system, which offers a versatile platform for the exploration of intriguing 1D physics and device applications.
- Authors:
-
- ShanghaiTech Univ. (China); University of Chinese Academy of Sciences, Beijing (China)
- Nanjing Univ. (China)
- Singapore Univ. of Technology and Design (Singapore)
- ShanghaiTech Univ. (China)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- ShanghaiTech Univ. (China); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of Oxford (United Kingdom)
- Tsinghua Univ., Beijing (China)
- ShanghaiTech Univ. (China); Univ. of Oxford (United Kingdom)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC)
- OSTI Identifier:
- 1878515
- Grant/Contract Number:
- AC02-05CH11231; 2017YFA0305400; MOE-T2EP50220-0011
- Resource Type:
- Accepted Manuscript
- Journal Name:
- npj Quantum Materials
- Additional Journal Information:
- Journal Volume: 7; Journal Issue: 1; Journal ID: ISSN 2397-4648
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Zhang, Jing, Lv, Yangyang, Feng, Xiaolong, Liang, Aiji, Xia, Wei, Mo, Sung-Kwan, Chen, Cheng, Xue, Jiamin, Yang, Shengyuan A., Yang, Lexian, Guo, Yanfeng, Chen, Yanbin, Chen, Yulin, and Liu, Zhongkai. Observation of dimension-crossover of a tunable 1D Dirac fermion in topological semimetal NbSixTe2. United States: N. p., 2022.
Web. doi:10.1038/s41535-022-00462-6.
Zhang, Jing, Lv, Yangyang, Feng, Xiaolong, Liang, Aiji, Xia, Wei, Mo, Sung-Kwan, Chen, Cheng, Xue, Jiamin, Yang, Shengyuan A., Yang, Lexian, Guo, Yanfeng, Chen, Yanbin, Chen, Yulin, & Liu, Zhongkai. Observation of dimension-crossover of a tunable 1D Dirac fermion in topological semimetal NbSixTe2. United States. https://doi.org/10.1038/s41535-022-00462-6
Zhang, Jing, Lv, Yangyang, Feng, Xiaolong, Liang, Aiji, Xia, Wei, Mo, Sung-Kwan, Chen, Cheng, Xue, Jiamin, Yang, Shengyuan A., Yang, Lexian, Guo, Yanfeng, Chen, Yanbin, Chen, Yulin, and Liu, Zhongkai. Tue .
"Observation of dimension-crossover of a tunable 1D Dirac fermion in topological semimetal NbSixTe2". United States. https://doi.org/10.1038/s41535-022-00462-6. https://www.osti.gov/servlets/purl/1878515.
@article{osti_1878515,
title = {Observation of dimension-crossover of a tunable 1D Dirac fermion in topological semimetal NbSixTe2},
author = {Zhang, Jing and Lv, Yangyang and Feng, Xiaolong and Liang, Aiji and Xia, Wei and Mo, Sung-Kwan and Chen, Cheng and Xue, Jiamin and Yang, Shengyuan A. and Yang, Lexian and Guo, Yanfeng and Chen, Yanbin and Chen, Yulin and Liu, Zhongkai},
abstractNote = {Condensed matter systems in low dimensions exhibit emergent physics that does not exist in three dimensions. When electrons are confined to one dimension (1D), some significant electronic states appear, such as charge density wave, spin-charge separations, and Su-Schrieffer-Heeger (SSH) topological state. However, a clear understanding of how the 1D electronic properties connects with topology is currently lacking. Here we systematically investigated the characteristic 1D Dirac fermion electronic structure originated from the metallic NbTe2 chains on the surface of the composition-tunable layered compound NbSixTe2 (x = 0.40 and 0.43) using angle-resolved photoemission spectroscopy. We found the Dirac fermion forms a Dirac nodal line structure protected by the combined $\widetilde {M_y}$ and time-reversal symmetry T and proves the NbSixTe2 system as a topological semimetal, in consistent with the ab-initio calculations. As x decreases, the interaction between adjacent NbTe2 chains increases and Dirac fermion goes through a dimension-crossover from 1D to 2D, as evidenced by the variation of its Fermi surface and Fermi velocity across the Brillouin zone in consistence with a Dirac SSH model. Our findings demonstrate a tunable 1D Dirac electron system, which offers a versatile platform for the exploration of intriguing 1D physics and device applications.},
doi = {10.1038/s41535-022-00462-6},
journal = {npj Quantum Materials},
number = 1,
volume = 7,
place = {United States},
year = {Tue May 24 00:00:00 EDT 2022},
month = {Tue May 24 00:00:00 EDT 2022}
}
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