Spin fluctuation induced Weyl semimetal state in the paramagnetic phase of EuCd2As2
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
Author(s)
Detail(s)
Original language | English |
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Article number | eaaw4718 |
Journal / Publication | Science Advances |
Volume | 5 |
Issue number | 7 |
Publication status | Published - 5 Jul 2019 |
Externally published | Yes |
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DOI | DOI |
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Attachment(s) | Documents
Publisher's Copyright Statement
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Link to Scopus | https://www.scopus.com/record/display.uri?eid=2-s2.0-85069843430&origin=recordpage |
Permanent Link | https://scholars.cityu.edu.hk/en/publications/publication(aa5d92b9-5191-415a-90e6-43d66a7cf0c2).html |
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
© 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.
In: Science Advances, Vol. 5, No. 7, eaaw4718, 05.07.2019.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
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