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  Pressure-Driven Magneto-Topological Phase Transition in a Magnetic Weyl Semimetal

Zeng, Q., Sun, H., Shen, J., Yao, Q., Zhang, Q., Li, N., et al. (2022). Pressure-Driven Magneto-Topological Phase Transition in a Magnetic Weyl Semimetal. Advanced quantum technologies, 2100149, pp. 1-9. doi:10.1002/qute.202100149.

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 Creators:
Zeng, Qingqi1, Author
Sun, Hongyi1, Author
Shen, Jianlei1, Author
Yao, Qiushi1, Author
Zhang, Qian1, Author
Li, Nana1, Author
Jiao, Lin1, Author
Wei, Hongxiang1, Author
Felser, Claudia2, Author              
Wang, Yonggang1, Author
Liu, Qihang1, Author
Liu, Enke1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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 Abstract: The co-occurrence of phase transitions with local and global order parameters, such as entangled magnetization and topological invariants, is attractive but seldom realized experimentally. In this study, a magneto-topological phase transition (magneto-TPT), that is, the phenomenon of magnetic materials undergoing different magnetic and topological phases during pressure loading, is investigated. By considering both out-of-plane ferromagnetic and in-plane antiferromagnetic components, it is discovered that the calculated results fit well with the experimental data. The calculation results further reveal a pristine Weyl phase with four additional pairs of Weyl nodes under low pressure, and a generally defined Z(2) topological insulator phase after the restoration of time-reversal symmetry at 40.4 GPa. The transport measurements performed at 5 K reveal that the magnetic order almost vanishes at 40.3 GPa, which is consistent with the theoretical prediction. Moreover, the present magneto-TPT involves the degeneration of a pair of crossing bands of two spin channels. Hence, all the chiral Weyl nodes annihilate with their counterparts from another spin channel, in contrast to the typical intraband annihilation of Weyl pairs in inversion-asymmetric systems. The study reveals a method for realizing diverse topological states by modulating exchange splitting by external physical knobs such as pressure in topological magnets.

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Language(s): eng - English
 Dates: 2022-02-082022-02-08
 Publication Status: Published in print
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 Rev. Type: -
 Identifiers: ISI: 000752244700001
DOI: 10.1002/qute.202100149
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Title: Advanced quantum technologies
Source Genre: Journal
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Pages: - Volume / Issue: - Sequence Number: 2100149 Start / End Page: 1 - 9 Identifier: CoNE: https://pure.mpg.de/cone/journals/resource/https://onlinelibrary.wiley.com/journal/25119044