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

Zeng Q, Sun H, Shen J, Yao Q, Zhang Q, Li N, Jiao L, Wei H, Felser C, Wang Y, Liu Q, Liu E (2022)

Publication Type: Journal article

Publication year: 2022

Journal

Advanced Quantum Technologies Wiley

DOI: 10.1002/qute.202100149

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 Z2 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.

Involved external institutions

University of Illinois at Urbana-Champaign US United States (USA) (US) Chinese Academy of Sciences (CAS) / 中国科学院 CN China (CN) Center for High Pressure Science & Technology Advanced Research (HPSTAR) CN China (CN) Southern University of Science and Technology CN China (CN) Shanxi University (SXU) / 山西大学 CN China (CN) Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids DE Germany (DE)

How to cite

APA:

Zeng, Q., Sun, H., Shen, J., Yao, Q., Zhang, Q., Li, N.,... Liu, E. (2022). Pressure-Driven Magneto-Topological Phase Transition in a Magnetic Weyl Semimetal. Advanced Quantum Technologies. https://doi.org/10.1002/qute.202100149

MLA:

Zeng, Qingqi, et al. "Pressure-Driven Magneto-Topological Phase Transition in a Magnetic Weyl Semimetal." Advanced Quantum Technologies (2022).

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