Anomalous Hall Conductivity and Nernst Effect of the Ideal Weyl Semimetallic Ferromagnet EuCd 2 As 2 .

Autor: Roychowdhury S; Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany., Yao M; Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany., Samanta K; Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany., Bae S; Department of Physics and Materials Research Laboratory, University of Illinois Urbana, Champaign, Urbana, IL, 61801, USA., Chen D; Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany., Ju S; Swiss Light Source, Paul Scherrer Institute, Villigen-PSI, CH-5232, Switzerland., Raghavan A; Department of Physics and Materials Research Laboratory, University of Illinois Urbana, Champaign, Urbana, IL, 61801, USA., Kumar N; Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany.; S. N. Bose National Centre for Basic Sciences, Salt Lake City, Kolkata, 700 106, India., Constantinou P; Swiss Light Source, Paul Scherrer Institute, Villigen-PSI, CH-5232, Switzerland., Guin SN; Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany.; Department of Chemistry, Birla Institute of Technology and Science, Pilani - Hyderabad Campus, Hyderabad, 500078, India., Plumb NC; Swiss Light Source, Paul Scherrer Institute, Villigen-PSI, CH-5232, Switzerland., Romanelli M; Department of Physics and Materials Research Laboratory, University of Illinois Urbana, Champaign, Urbana, IL, 61801, USA., Borrmann H; Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany., Vergniory MG; Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany.; Donostia International Physics Center, Donostia-San Sebastian, 20018, Spain., Strocov VN; Swiss Light Source, Paul Scherrer Institute, Villigen-PSI, CH-5232, Switzerland., Madhavan V; Department of Physics and Materials Research Laboratory, University of Illinois Urbana, Champaign, Urbana, IL, 61801, USA., Shekhar C; Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany., Felser C; Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany.
Jazyk: angličtina
Zdroj: Advanced science (Weinheim, Baden-Wurttemberg, Germany) [Adv Sci (Weinh)] 2023 May; Vol. 10 (13), pp. e2207121. Date of Electronic Publication: 2023 Feb 24.
DOI: 10.1002/advs.202207121
Abstrakt: 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) EuCd 2 As 2 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.
(© 2023 The Authors. Advanced Science published by Wiley-VCH GmbH.)
Databáze: MEDLINE
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