TY - JOUR
T1 - Anomalous Hall Conductivity and Nernst Effect of the Ideal Weyl Semimetallic Ferromagnet EuCd2As2
AU - Roychowdhury, Subhajit
AU - Yao, Mengyu
AU - Samanta, Kartik
AU - Bae, Seokjin
AU - Chen, Dong
AU - Ju, Sailong
AU - Raghavan, Arjun
AU - Kumar, Nitesh
AU - Constantinou, Procopios
AU - Guin, Satya N.
AU - Plumb, Nicholas Clark
AU - Romanelli, Marisa
AU - Borrmann, Horst
AU - Vergniory, Maia G.
AU - Strocov, Vladimir N.
AU - Madhavan, Vidya
AU - Shekhar, Chandra
AU - Felser, Claudia
N1 - Funding Information:
S.R., M.Y., and K.S. contributed equally to this work. S.R. thanks the Alexander von Humboldt Foundation for a fellowship. This work was financially supported by the European Union's Horizon 2020 research and innovation program (grant no. 766566); Deutsche Forschungsgemeinschaft (DFG) under SFB1143 (Project No. 247310070); the European Research Council (ERC) Advanced Grant no. 742068 (“TOPMAT”); and Würzburg‐Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter—ct.qmat (EXC 2147, project no. 390858490). M.G.V. thanks support to Programa Red Guipuzcoana de Ciencia Tecnologia e Innovacion 2021 no. 2021 CIEN‐000070‐01 Gipuzkoa Next and the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) GA 3314/1‐1 – FOR 5249 (QUAST).
Publisher Copyright:
© 2023 The Authors. Advanced Science published by Wiley-VCH GmbH.
PY - 2023/5/5
Y1 - 2023/5/5
N2 - Weyl semimetal is a unique topological phase with topologically protected band crossings in the bulk and robust surface states called Fermi arcs. Weyl nodes always appear in pairs with opposite chiralities, and they need to have either time-reversal or inversion symmetry broken. When the time-reversal symmetry is broken the minimum number of Weyl points (WPs) is two. If these WPs are located at the Fermi level, they form an ideal Weyl semimetal (WSM). In this study, intrinsic ferromagnetic (FM) EuCd2As2 are grown, predicted to be an ideal WSM and studied its electronic structure by angle-resolved photoemission spectroscopy, and scanning tunneling microscopy which agrees closely with the first principles calculations. Moreover, anomalous Hall conductivity and Nernst effect are observed, resulting from the non-zero Berry curvature, and the topological Hall effect arising from changes in the band structure caused by spin canting produced by magnetic fields. These findings can help realize several exotic quantum phenomena in inorganic topological materials that are otherwise difficult to assess because of the presence of multiple pairs of Weyl nodes.
AB - Weyl semimetal is a unique topological phase with topologically protected band crossings in the bulk and robust surface states called Fermi arcs. Weyl nodes always appear in pairs with opposite chiralities, and they need to have either time-reversal or inversion symmetry broken. When the time-reversal symmetry is broken the minimum number of Weyl points (WPs) is two. If these WPs are located at the Fermi level, they form an ideal Weyl semimetal (WSM). In this study, intrinsic ferromagnetic (FM) EuCd2As2 are grown, predicted to be an ideal WSM and studied its electronic structure by angle-resolved photoemission spectroscopy, and scanning tunneling microscopy which agrees closely with the first principles calculations. Moreover, anomalous Hall conductivity and Nernst effect are observed, resulting from the non-zero Berry curvature, and the topological Hall effect arising from changes in the band structure caused by spin canting produced by magnetic fields. These findings can help realize several exotic quantum phenomena in inorganic topological materials that are otherwise difficult to assess because of the presence of multiple pairs of Weyl nodes.
KW - Nernst effect
KW - Weyl semimetal
KW - anomalous hall
KW - ferromagnet
KW - magnetoresistance
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U2 - 10.1002/advs.202207121
DO - 10.1002/advs.202207121
M3 - Article
C2 - 36828783
AN - SCOPUS:85148762533
SN - 2198-3844
VL - 10
JO - Advanced Science
JF - Advanced Science
IS - 13
M1 - 2207121
ER -