Electronic Properties of the Weyl Semimetals Co2MnX (X=Si, Ge, Sn)

Sharan, Abhishek; Crasto de Lima, Felipe; Khalid, Shoaib; Miwa, Roberto H.; Janotti, Anderson

doi:10.1002/pssr.202100652

Title: Electronic Properties of the Weyl Semimetals Co₂MnX (X=Si, Ge, Sn)

Journal Article · 15 February 2022 · Physica Status Solidi. Rapid Research Letters

DOI: https://doi.org/10.1002/pssr.202100652 · OSTI ID:1976390

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University of Delaware, Newark, DE (United States); OSTI
University of Delaware, Newark, DE (United States); National Center for Research in Energy and Materials (CNPEM)
University of Delaware, Newark, DE (United States); National University of Science and Technology, Islanabad (Pakistan)
Federal University of Uberlandia (Brazil)
University of Delaware, Newark, DE (United States)

Using first-principles electronic structure calculations, iwe show that ferromagnetic Heusler compounds Co2MnX (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.

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Research Organization:: University of California, Santa Barbara, CA (United States); University of California, Oakland, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); Minas Gerais State Agency for Research and Development (FAPEMIG); National Council for Scientific and Technological Development (CNPq)

Grant/Contract Number:: SC0014388; AC02-05CH11231

OSTI ID:: 1976390

Journal Information:: Physica Status Solidi. Rapid Research Letters, Journal Name: Physica Status Solidi. Rapid Research Letters Journal Issue: 5 Vol. 16; ISSN 1862-6254

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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