Ideal Weyl semimetal induced by magnetic exchange

J. R. Soh; F. De Juan; M. G. Vergniory; N. B.M. Schröter; M. C. Rahn; D. Y. Yan; J. Jiang; M. Bristow; P. A. Reiss; J. N. Blandy; Y. F. Guo; Y. G. Shi; T. K. Kim; A. McCollam; S. H. Simon; Y. Chen; A. I. Coldea; A. T. Boothroyd

doi:10.1103/PhysRevB.100.201102

Ideal Weyl semimetal induced by magnetic exchange

J. R. Soh
, F. De Juan
, M. G. Vergniory
, N. B.M. Schröter
, M. C. Rahn
, D. Y. Yan
, J. Jiang
, M. Bristow
, P. A. Reiss
, J. N. Blandy
, Y. F. Guo
, Y. G. Shi
, T. K. Kim
, A. McCollam
, S. H. Simon
, Y. Chen
, A. I. Coldea
, A. T. Boothroyd

Research output: Contribution to journal › Article › peer-review

Abstract

We report theoretical and experimental evidence that EuCd2As2 in magnetic fields greater than 1.6 T applied along the c axis is a Weyl semimetal with a single pair of Weyl nodes. Ab initio electronic structure calculations, verified at zero field by angle-resolved photoemission spectra, predict Weyl nodes with wave vectors k=(0,0,±0.03)×2π/c at the Fermi level when the Eu spins are fully aligned along the c axis. Shubnikov-de Haas oscillations measured in fields parallel to c reveal a cyclotron effective mass of mc∗=0.08me and a Fermi surface of extremal area Aext=0.24nm-2, corresponding to 0.1% of the area of the Brillouin zone. The small values of mc∗ and Aext are consistent with quasiparticles near a Weyl node. The identification of EuCd2As2 as a model Weyl semimetal opens the door to fundamental tests of Weyl physics.

Original language	English
Article number	201102
Journal	Physical Review B
Volume	100
Issue number	20
DOIs	https://doi.org/10.1103/PhysRevB.100.201102
Publication status	Published - 13 Nov 2019
Externally published	Yes

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Soh, J. R., De Juan, F., Vergniory, M. G., Schröter, N. B. M., Rahn, M. C., Yan, D. Y., Jiang, J., Bristow, M., Reiss, P. A., Blandy, J. N., Guo, Y. F., Shi, Y. G., Kim, T. K., McCollam, A., Simon, S. H., Chen, Y., Coldea, A. I., & Boothroyd, A. T. (2019). Ideal Weyl semimetal induced by magnetic exchange. Physical Review B, 100(20), Article 201102. https://doi.org/10.1103/PhysRevB.100.201102

@article{090783aed5094f1090da5a8086b47560,

title = "Ideal Weyl semimetal induced by magnetic exchange",

abstract = "We report theoretical and experimental evidence that EuCd2As2 in magnetic fields greater than 1.6 T applied along the c axis is a Weyl semimetal with a single pair of Weyl nodes. Ab initio electronic structure calculations, verified at zero field by angle-resolved photoemission spectra, predict Weyl nodes with wave vectors k=(0,0,±0.03)×2π/c at the Fermi level when the Eu spins are fully aligned along the c axis. Shubnikov-de Haas oscillations measured in fields parallel to c reveal a cyclotron effective mass of mc∗=0.08me and a Fermi surface of extremal area Aext=0.24nm-2, corresponding to 0.1\% of the area of the Brillouin zone. The small values of mc∗ and Aext are consistent with quasiparticles near a Weyl node. The identification of EuCd2As2 as a model Weyl semimetal opens the door to fundamental tests of Weyl physics.",

author = "Soh, \{J. R.\} and \{De Juan\}, F. and Vergniory, \{M. G.\} and Schr{\"o}ter, \{N. B.M.\} and Rahn, \{M. C.\} and Yan, \{D. Y.\} and J. Jiang and M. Bristow and Reiss, \{P. A.\} and Blandy, \{J. N.\} and Guo, \{Y. F.\} and Shi, \{Y. G.\} and Kim, \{T. K.\} and A. McCollam and Simon, \{S. H.\} and Y. Chen and Coldea, \{A. I.\} and Boothroyd, \{A. T.\}",

note = "Publisher Copyright: {\textcopyright} 2019 American Physical Society.",

year = "2019",

month = nov,

day = "13",

doi = "10.1103/PhysRevB.100.201102",

language = "English",

volume = "100",

journal = "Physical Review B",

issn = "2469-9950",

publisher = "American Physical Society",

number = "20",

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TY - JOUR

T1 - Ideal Weyl semimetal induced by magnetic exchange

AU - Soh, J. R.

AU - De Juan, F.

AU - Vergniory, M. G.

AU - Schröter, N. B.M.

AU - Rahn, M. C.

AU - Yan, D. Y.

AU - Jiang, J.

AU - Bristow, M.

AU - Reiss, P. A.

AU - Blandy, J. N.

AU - Guo, Y. F.

AU - Shi, Y. G.

AU - Kim, T. K.

AU - McCollam, A.

AU - Simon, S. H.

AU - Chen, Y.

AU - Coldea, A. I.

AU - Boothroyd, A. T.

PY - 2019/11/13

Y1 - 2019/11/13

N2 - We report theoretical and experimental evidence that EuCd2As2 in magnetic fields greater than 1.6 T applied along the c axis is a Weyl semimetal with a single pair of Weyl nodes. Ab initio electronic structure calculations, verified at zero field by angle-resolved photoemission spectra, predict Weyl nodes with wave vectors k=(0,0,±0.03)×2π/c at the Fermi level when the Eu spins are fully aligned along the c axis. Shubnikov-de Haas oscillations measured in fields parallel to c reveal a cyclotron effective mass of mc∗=0.08me and a Fermi surface of extremal area Aext=0.24nm-2, corresponding to 0.1% of the area of the Brillouin zone. The small values of mc∗ and Aext are consistent with quasiparticles near a Weyl node. The identification of EuCd2As2 as a model Weyl semimetal opens the door to fundamental tests of Weyl physics.

AB - We report theoretical and experimental evidence that EuCd2As2 in magnetic fields greater than 1.6 T applied along the c axis is a Weyl semimetal with a single pair of Weyl nodes. Ab initio electronic structure calculations, verified at zero field by angle-resolved photoemission spectra, predict Weyl nodes with wave vectors k=(0,0,±0.03)×2π/c at the Fermi level when the Eu spins are fully aligned along the c axis. Shubnikov-de Haas oscillations measured in fields parallel to c reveal a cyclotron effective mass of mc∗=0.08me and a Fermi surface of extremal area Aext=0.24nm-2, corresponding to 0.1% of the area of the Brillouin zone. The small values of mc∗ and Aext are consistent with quasiparticles near a Weyl node. The identification of EuCd2As2 as a model Weyl semimetal opens the door to fundamental tests of Weyl physics.

UR - https://www.scopus.com/pages/publications/85075281231

U2 - 10.1103/PhysRevB.100.201102

DO - 10.1103/PhysRevB.100.201102

M3 - Article

AN - SCOPUS:85075281231

SN - 2469-9950

VL - 100

JO - Physical Review B

JF - Physical Review B

IS - 20

M1 - 201102

ER -

Ideal Weyl semimetal induced by magnetic exchange

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