Spin fluctuation induced Weyl semimetal state in the paramagnetic phase of EuCd2As2

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • S. M. Nie
  • C. J. Yi
  • J. Jandke
  • T. Shang
  • M. Y. Yao
  • M. Naamneh
  • L. Q. Yan
  • Y. Sun
  • A. Chikina
  • V. N. Strocov
  • M. Medarde
  • M. Song
  • Y. -M. Xiong
  • G. Xu
  • W. Wulfhekel
  • J. Mesot
  • M. Reticcioli
  • C. Franchini
  • C. Mudry
  • M. Müller
  • Y. G. Shi
  • T. Qian
  • H. Ding
  • M. Shi

Detail(s)

Original languageEnglish
Article numbereaaw4718
Journal / PublicationScience Advances
Volume5
Issue number7
Publication statusPublished - 5 Jul 2019
Externally publishedYes

Link(s)

Abstract

Weyl fermions as emergent quasiparticles can arise in Weyl semimetals (WSMs) in which the energy bands are nondegenerate, resulting from inversion or time-reversal symmetry breaking. Nevertheless, experimental evidence for magnetically induced WSMs is scarce. Here, using photoemission spectroscopy, we observe that the degeneracy of Bloch bands is already lifted in the paramagnetic phase of EuCd2As2. We attribute this effect to the itinerant electrons experiencing quasi-static and quasi–long-range ferromagnetic fluctuations. Moreover, the spin-nondegenerate band structure harbors a pair of ideal Weyl nodes near the Fermi level. Hence, we show that long-range magnetic order and the spontaneous breaking of time-reversal symmetry are not essential requirements for WSM states in centrosymmetric systems and that WSM states can emerge in a wider range of condensed matter systems than previously thought.

© 2019 The Authors

Research Area(s)

Citation Format(s)

Spin fluctuation induced Weyl semimetal state in the paramagnetic phase of EuCd2As2. / Ma, J. Z.; Nie, S. M.; Yi, C. J. et al.
In: Science Advances, Vol. 5, No. 7, eaaw4718, 05.07.2019.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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