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Time-Reversal Symmetry Breaking Driven Topological Phase Transition in EuB_{6}
- Source :
- Physical Review X, Vol 11, Iss 2, p 021016 (2021), Gao, S Y, Xu, S, Li, H, Yi, C J, Nie, S M, Rao, Z C, Wang, H, Hu, Q X, Chen, X Z, Fan, W H, Huang, J R, Huang, Y B, Pryds, N, Shi, M, Wang, Z J, Shi, Y G, Xia, T L, Qian, T & Ding, H 2021, ' Time-Reversal Symmetry Breaking Driven Topological Phase Transition in EuB6 ', Physical Review X, vol. 11, no. 2, 021016 . https://doi.org/10.1103/PhysRevX.11.021016
- Publication Year :
- 2021
- Publisher :
- American Physical Society, 2021.
-
Abstract
- The interplay between time-reversal symmetry (TRS) and band topology plays a crucial role in topological states of quantum matter. In time-reversal-invariant (TRI) systems, the inversion of spin-degenerate bands with opposite parity leads to nontrivial topological states, such as topological insulators and Dirac semimetals. When the TRS is broken, the exchange field induces spin splitting of the bands. The inversion of a pair of spin-splitting subbands can generate more exotic topological states, such as quantum anomalous Hall insulators and magnetic Weyl semimetals. So far, such topological phase transitions driven by the TRS breaking have not been visualized. In this work, using angle-resolved photoemission spectroscopy, we have demonstrated that the TRS breaking induces a band inversion of a pair of spin-splitting subbands at the TRI points of Brillouin zone in EuB$_6$, when a long-range ferromagnetic order is developed. The dramatic changes in the electronic structure result in a topological phase transition from a TRI ordinary insulator state to a TRS-broken topological semimetal (TSM) state. Remarkably, the magnetic TSM state has an ideal electronic structure, in which the band crossings are located at the Fermi level without any interference from other bands. Our findings not only reveal the topological phase transition driven by the TRS breaking, but also provide an excellent platform to explore novel physical behavior in the magnetic topological states of quantum matter.<br />Comment: 22 pages, 7 figures, accepted by Phys. Rev. X
- Subjects :
- Physics
Condensed Matter - Materials Science
Ideal (set theory)
Condensed matter physics
Strongly Correlated Electrons (cond-mat.str-el)
QC1-999
General Physics and Astronomy
Materials Science (cond-mat.mtrl-sci)
FOS: Physical sciences
State (functional analysis)
01 natural sciences
010305 fluids & plasmas
Condensed Matter - Strongly Correlated Electrons
Ferromagnetism
T-symmetry
0103 physical sciences
Topological order
Condensed Matter::Strongly Correlated Electrons
010306 general physics
Subjects
Details
- Language :
- English
- ISSN :
- 21603308
- Volume :
- 11
- Issue :
- 2
- Database :
- OpenAIRE
- Journal :
- Physical Review X
- Accession number :
- edsair.doi.dedup.....563b8a3510b22c64c30bb170eede5a1b