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Type:	Artigo de Periódico
Title:	Interplay between magnetic, metal/insulator and topological phases in Hg1−xMnxTe alloys: prediction of a ferromagnetic Weyl semimetal at x  =  0.25
Authors:	Orlando José Silveira Júnior Luiz Cláudio de Carvalho Horacio Wagner Leite Alves Helio Chacham
Abstract:	We report a theoretical investigation of magnetic, electronic, and topological properties of Hg1−xMnxTe alloys. We consider periodic structures with Mn concentrations as x  =  0, 0.25, 0.5, 0.75, and 1. Our hybrid DFT/Hartree–Fock calculations for the bandgaps of antiferromagnetic (ground-state) phases are in good agreement with experiments. The calculations also show that the modification of the magnetic ordering from anti- to ferromagnetic leads to a significant bandgap reduction, resulting in a metal/insulator transition at higher Mn concentrations. We show that a ferromagnetic Weyl semimetal phase is achieved for x  =  0.25, where a single pair of Weyl nodes mirrored by the point in the momentum space is observed. The non-trivial topological property of the ferromagnetic Hg0.75Mn0.25Te is confirmed by the calculation of the chirality of each Weyl node, which are connected by a surface Fermi arc of a semi infinite Hg0.75Mn0.25Te.
Subject:	Magnetismo Ligas Teoria do funcional da densidade
language:	eng
metadata.dc.publisher.country:	Brasil
Publisher:	Universidade Federal de Minas Gerais
Publisher Initials:	UFMG
metadata.dc.publisher.department:	ICX - DEPARTAMENTO DE FÍSICA
Rights:	Acesso Restrito
metadata.dc.identifier.doi:	https://doi.org/10.1088/1361-648X/ab3270
URI:	http://hdl.handle.net/1843/64160
Issue Date:	2019
metadata.dc.url.externa:	https://iopscience.iop.org/article/10.1088/1361-648X/ab3270
metadata.dc.relation.ispartof:	Journal of Physics: Condensed Matter
Appears in Collections:	Artigo de Periódico

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