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Strain induced metal-semiconductor transition in two-dimensional topological half metals

Spintronic applications of two-dimensional (2D) magnetic half metals and semiconductors are thought to be very promising. Here, we suggest a family of stable 2D materials [Formula: see text] [Formula: see text] (X = Cl, Br, and I). The monolayer [Formula: see text] [Formula: see text] exhibits an in...

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Detalles Bibliográficos
Autor principal: You, Jing-Yang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Elsevier 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10156612/
https://www.ncbi.nlm.nih.gov/pubmed/37153446
http://dx.doi.org/10.1016/j.isci.2023.106312
Descripción
Sumario:Spintronic applications of two-dimensional (2D) magnetic half metals and semiconductors are thought to be very promising. Here, we suggest a family of stable 2D materials [Formula: see text] [Formula: see text] (X = Cl, Br, and I). The monolayer [Formula: see text] [Formula: see text] exhibits an in-plane ferromagnetic (FM) ground state with a Curie temperature of 118 K, which is unveiled to be a 2D Weyl half semimetal with two Weyl points of opposite chirality connected by a remarkable Fermi arc. In addition, it appears that a biaxial tensile strain can lead to a metal-semiconductor phase transition as a result of the increased anomalous Jahn-Teller distortions, which raise the degeneracy of the [Formula: see text] energy level and cause a significant energy splitting. A 10% biaxial tensile strain also increases the Curie temperature to about 159 K, which originates from the enhanced Mn-Cl-Mn FM superexchange. Moreover, the metal-semiconductor transition can also be induced by a uniaxial strain. Our findings provide an idea to create 2D magnetic semiconductors through metal-semiconductor transition in half metals.