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Tuneable quantum spin Hall states in confined 1T' transition metal dichalcogenides

Das, B and Sen, D and Mahapatra, S (2020) Tuneable quantum spin Hall states in confined 1T' transition metal dichalcogenides. In: Scientific Reports, 10 (1).

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Official URL: https://dx.doi.org/10.1038/s41598-020-63450-5


Investigation of quantum spin Hall states in 1T' phase of the monolayer transition metal dichalcogenides has recently attracted the attention for its potential in nanoelectronic applications. While most of the theoretical findings in this regard deal with infinitely periodic crystal structures, here we employ density functional theory calculations and k. p Hamiltonian based continuum model to unveil the bandgap opening in the edge-state spectrum of finite width molybdenum disulphide, molybdenum diselenide, tungsten disulphide and tungsten diselenide. We show that the application of a perpendicular electric field simultaneously modulates the band gaps of bulk and edge-states. We further observe that tungsten diselenide undergoes a semi-metallic intermediate state during the phase transition from topological to normal insulator. The tuneable edge conductance, as obtained from the Landauer-Büttiker formalism, exhibits a monotonous increasing trend with applied electric field for deca-nanometer molybdenum disulphide, whereas the trend is opposite for other cases. © 2020, The Author(s).

Item Type: Journal Article
Publication: Scientific Reports
Publisher: Nature Research
Additional Information: Copyright of this article belongs to Nature Research
Department/Centre: Division of Electrical Sciences > Electronic Systems Engineering (Formerly Centre for Electronic Design & Technology)
Division of Physical & Mathematical Sciences > Centre for High Energy Physics
Date Deposited: 17 Nov 2020 11:41
Last Modified: 17 Nov 2020 11:41
URI: http://eprints.iisc.ac.in/id/eprint/65338

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