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

J. Z. Ma; 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

doi:10.1126/sciadv.aaw4718

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

J. Z. Ma, 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. MudryM. Müller, Y. G. Shi, T. Qian, H. Ding, M. Shi

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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.

Original language	English
Article number	eaaw4718
Journal	Science advances
Volume	5
Issue number	7
DOIs	https://doi.org/10.1126/sciadv.aaw4718
State	Published - 12 Jul 2019
Externally published	Yes

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Ma, J. Z., Nie, S. M., Yi, C. J., Jandke, J., Shang, T., Yao, M. Y., Naamneh, M., Yan, L. Q., Sun, Y., Chikina, A., Strocov, V. N., Medarde, M., Song, M., Xiong, Y. M., Xu, G., Wulfhekel, W., Mesot, J., Reticcioli, M., Franchini, C., ... Shi, M. (2019). Spin fluctuation induced Weyl semimetal state in the paramagnetic phase of EuCd₂As₂ Science advances, 5(7), Article eaaw4718. https://doi.org/10.1126/sciadv.aaw4718

@article{c11f03c16cd64792a2e518f4735c3b3a,

title = "Spin fluctuation induced Weyl semimetal state in the paramagnetic phase of EuCd2As2 ",

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.",

author = "Ma, {J. Z.} and Nie, {S. M.} and Yi, {C. J.} and J. Jandke and T. Shang and Yao, {M. Y.} and M. Naamneh and Yan, {L. Q.} and Y. Sun and A. Chikina and Strocov, {V. N.} and M. Medarde and M. Song and Xiong, {Y. M.} and G. Xu and W. Wulfhekel and J. Mesot and M. Reticcioli and C. Franchini and C. Mudry and M. M{\"u}ller and Shi, {Y. G.} and T. Qian and H. Ding and M. Shi",

note = "Publisher Copyright: Copyright {\textcopyright} 2019 The Authors, some rights reserved;",

year = "2019",

month = jul,

day = "12",

doi = "10.1126/sciadv.aaw4718",

language = "English",

volume = "5",

journal = "Science advances",

issn = "2375-2548",

publisher = "American Association for the Advancement of Science",

number = "7",

}

Ma, JZ, Nie, SM, Yi, CJ, Jandke, J, Shang, T, Yao, MY, Naamneh, M, Yan, LQ, Sun, Y, Chikina, A, Strocov, VN, Medarde, M, Song, M, Xiong, YM, Xu, G, Wulfhekel, W, Mesot, J, Reticcioli, M, Franchini, C, Mudry, C, Müller, M, Shi, YG, Qian, T, Ding, H & Shi, M 2019, 'Spin fluctuation induced Weyl semimetal state in the paramagnetic phase of EuCd₂As₂ ', Science advances, vol. 5, no. 7, eaaw4718. https://doi.org/10.1126/sciadv.aaw4718

TY - JOUR

T1 - Spin fluctuation induced Weyl semimetal state in the paramagnetic phase of EuCd2As2

AU - Ma, J. Z.

AU - Nie, S. M.

AU - Yi, C. J.

AU - Jandke, J.

AU - Shang, T.

AU - Yao, M. Y.

AU - Naamneh, M.

AU - Yan, L. Q.

AU - Sun, Y.

AU - Chikina, A.

AU - Strocov, V. N.

AU - Medarde, M.

AU - Song, M.

AU - Xiong, Y. M.

AU - Xu, G.

AU - Wulfhekel, W.

AU - Mesot, J.

AU - Reticcioli, M.

AU - Franchini, C.

AU - Mudry, C.

AU - Müller, M.

AU - Shi, Y. G.

AU - Qian, T.

AU - Ding, H.

AU - Shi, M.

PY - 2019/7/12

Y1 - 2019/7/12

N2 - 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.

AB - 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.

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U2 - 10.1126/sciadv.aaw4718

DO - 10.1126/sciadv.aaw4718

M3 - Article

C2 - 31309151

AN - SCOPUS:85069843430

SN - 2375-2548

VL - 5

JO - Science advances

JF - Science advances

IS - 7

M1 - eaaw4718

ER -

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

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