Bilayers of Ni3C12S12 and Pt3C12S12: graphene-like 2D topological insulators tunable by electric fields
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Universidade Federal de Minas Gerais
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Resumo
In the present work we predict, through first-principles calculations, that bilayers of the
recently synthesized Ni 3C12S 12 and Pt 3C12S 12 layered materials are topological insulators
upon electron doping, and that their topological insulator properties can be modulated by
the application of electric fields with magnitudes achievable in devices. The electronic
structures of both bilayers are characterized by spin–orbit split graphene-like bands, with gap
magnitudes that are three orders of magnitude larger than graphene’s. In ribbon geometries,
chiral edge modes develop at each side with band dispersions similar to that of Kane–Mele
graphene model. Surprisingly, the edge states’ spin-propagation locking occurs even for very
thin ribbons. We also find that the response of the electronic structure of both materials to
applied electric fields are similar to both graphene and the Kane–Mele model with a Rashba
term. All these findings indicate that these bilayer systems can be considered as large-spin–orbit graphene analogues with a strong sensitivity to applied electric fields.
Abstract
Assunto
Isoladores topológicos, Propriedades eletrônicas
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Topological insulators, Metal-organic frameworks, Electronic properties
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Endereço externo
https://iopscience.iop.org/article/10.1088/1361-648X/aa8ec1