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Nontrivial topology and topological phase transition in two-dimensional monolayer Tl

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Abstract

Topological insulating material with dissipationless edge states is a rising star in spintronics. While most two-dimensional (2D) topological insulators belong to group-IV or -V elements in a honeycomb lattice, herein, we propose a new topological phase in the 2D hexagonal group-III crystal, h-Tl, based on a tight-binding model and density-functional theory calculation. Analysis of band dispersion reveals a Dirac nodal-ring near the Fermi level, which is attributed to px,y/pz band crossing. Upon inclusion of spin–orbit coupling (SOC), h-Tl turns into a quantum spin Hall insulator under 21% biaxial strain, confirmed by integrating spin Berry curvature in the Brillouin zone and spin-polarized edge states. A prominent feature of its electronic properties is that the effect of SOC plays two essential roles of both topological gap opening and band inversion between px,y/pz orbitals, which is the first observed phenomenon in 2D materials. This study extends the scope of 2D elemental topological insulators and presents a platform to design new 2D topotronics materials.

Graphical abstract: Nontrivial topology and topological phase transition in two-dimensional monolayer Tl

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Publication details

The article was received on 26 Apr 2018, accepted on 03 Sep 2018 and first published on 04 Sep 2018


Article type: Paper
DOI: 10.1039/C8CP02649A
Citation: Phys. Chem. Chem. Phys., 2018, Advance Article
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    Nontrivial topology and topological phase transition in two-dimensional monolayer Tl

    J. Zhang, W. Ji, C. Zhang, P. Li and P. Wang, Phys. Chem. Chem. Phys., 2018, Advance Article , DOI: 10.1039/C8CP02649A

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