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Issue 24, 2016
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Tuning Dirac points by strain in MoX2 nanoribbons (X = S, Se, Te) with a 1T′ structure

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Abstract

For practical applications of two-dimensional topological insulators, large band gaps and Dirac states within the band gap are desirable because they allow for device operation at room temperature and quantum transport without dissipation. Based on first-principles density functional calculations, we report the tunability of the electronic structure by strain engineering in quasi-one-dimensional nanoribbons of transition metal dichalcogenides with a 1T′ structure, MoX2 with X = (S, Se, Te). We find that both the band gaps and Dirac points in 1T′-MoX2 can be engineered by applying an external strain, thereby leading to a single Dirac cone within the bulk band gap. Considering the gap size and the location of the Dirac point, we suggest that, among 1T′-MoX2 nanoribbons, MoSe2 is the most suitable candidate for quantum spin Hall (QSH) devices.

Graphical abstract: Tuning Dirac points by strain in MoX2 nanoribbons (X = S, Se, Te) with a 1T′ structure

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Publication details

The article was received on 04 Apr 2016, accepted on 20 May 2016 and first published on 20 May 2016


Article type: Paper
DOI: 10.1039/C6CP02204A
Citation: Phys. Chem. Chem. Phys., 2016,18, 16361-16366
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    Tuning Dirac points by strain in MoX2 nanoribbons (X = S, Se, Te) with a 1T′ structure

    H. Sung, D. Choe and K. J. Chang, Phys. Chem. Chem. Phys., 2016, 18, 16361
    DOI: 10.1039/C6CP02204A

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