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Electronic Properties of the Weyl Semimetals Co 2 MnX (X=Si, Ge, Sn)
Author(s) -
Sharan Abhishek,
Crasto de Lima Felipe,
Khalid Shoaib,
Miwa Roberto H.,
Janotti Anderson
Publication year - 2022
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.202100652
Subject(s) - brillouin zone , semimetal , spin (aerodynamics) , condensed matter physics , physics , fermi gamma ray space telescope , perpendicular , band gap , topology (electrical circuits) , weyl semimetal , fermi level , ferromagnetism , electronic band structure , quantum mechanics , geometry , mathematics , combinatorics , thermodynamics , electron
Using first‐principles electronic structure calculations, it is shown that ferromagnetic Heusler compounds Co 2 MnX (X = Si, Ge, Sn) present nontrivial topological characteristics and belong to the category of Weyl semimetals. These materials exhibit two topologically interesting band crossings near the Fermi level. These band crossings have complex 3D geometries in the Brillouin zone and are characterized by nontrivial topology as Hopf links and chain‐like nodal lines that are protected by the perpendicular mirror planes. The spin–orbit interaction split these nodal lines into several 0D Weyl band crossings. Unlike previously known topologically nontrivial Heusler materials, these majority spin band crossings lie in or very near to the bandgap of minority spin bands, potentially facilitating experimental observation.