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  Topological phase transition in a magnetic Weyl semimetal

Liu, D. F., Xu, Q. N., Liu, E. K., Shen, J. L., Le, C. C., Li, Y. W., et al. (2021). Topological phase transition in a magnetic Weyl semimetal. Physical Review B, 104(20): 205140. doi:10.1103/PhysRevB.104.205140.

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 Creators:
Liu, D. F.1, Author              
Xu, Q. N.2, Author
Liu, E. K.2, Author
Shen, J. L.2, Author
Le, C. C.2, Author
Li, Y. W.2, Author
Pei, D.2, Author
Liang, A. J.2, Author
Dudin, P.2, Author
Kim, T. K.2, Author
Cacho, C.2, Author
Xu, Y. F.3, Author              
Sun, Y.2, Author
Yang, L. X.2, Author
Liu, Z. K.2, Author
Felser, C.2, Author
Parkin, S. S. P.2, Author
Chen, Y. L.2, Author
Affiliations:
1Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society, ou_3287476              
2external, ou_persistent22              
3Max Planck Institute of Microstructure Physics, Max Planck Society, ou_2415691              

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 Abstract: Topological Weyl semimetals (TWSs) are exotic crystals possessing emergent relativistic Weyl fermions connected by unique surface Fermi arcs (SFAs) in their electronic structures. To realize the TWS state, certain symmetries (such as the inversion or time reversal symmetry) must be broken, leading to a topological phase transition (TPT). Despite the great importance in understanding the formation of TWSs and their unusual properties, direct observation of such a TPT has been challenging. Here, using a recently discovered magnetic TWS Co3Sn2S2, we were able to systematically study its TPT with detailed temperature dependence of the electronic structures by angle-resolved photoemission spectroscopy. The TPT with drastic band structure evolution was clearly observed across the Curie temperature (TC = 177K), including the disappearance of the characteristic SFAs and the recombination of the spin-split bands that leads to the annihilation of Weyl points with opposite chirality. These results not only reveal important insights on the interplay between the magnetism and band topology in TWSs, but also provide a method to control their exotic physical properties.

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 Dates: 2021-11-292021-11-15
 Publication Status: Published in print
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 104 (20) Sequence Number: 205140 Start / End Page: - Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008