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Exploring topological phase transition in Pt2Hg1−xTlxSe3
- Source :
- Bibechana, Vol 20, Iss 3 (2023)
- Publication Year :
- 2023
- Publisher :
- Department of Physics, Mahendra Morang Adarsh Multiple Campus, Tribhuvan University, 2023.
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Abstract
- The transition from trivial to non-trivial phase in two-dimensional materials are called a topological phase transition (TPT). The Berry phase, non-local string order parameter, and edge states define the topological nature of the system. A newly discovered jacutingaite ma- terial Pt2HgSe3 is a layered material which occurs naturally in the form of minerals. The material can be exfoliated and was predicted as a quantum spin Hall insulator. Here, on the basis of density functional theory and tight-binding calculations, we explore Pt2Hg1−xTlxSe3 (x = 0.25, 0.50, 0.75, 1) to understand the electronic and topological properties. We start with the parent material Pt2HgSe3 wherein Hg is replaced partially with x amount of Tl, to tune the topological phases. From the electronic structure calculations, Pt2HgSe3 is found to be a non-trivial semimetal in it’s bulk. Upon electron doping, the material transforms to strong topological metallic phase. The topological Z2 invariant calculation shows TPT in Pt2Hg1−xTlxSe3 with weak topological insulating state (0;001) for x=0, to strong topological metal (1;000) for x=1, respectively.
Details
- Language :
- English
- ISSN :
- 20910762 and 23825340
- Volume :
- 20
- Issue :
- 3
- Database :
- Directory of Open Access Journals
- Journal :
- Bibechana
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.1dc614c273c349c2a6e46ebb30d1348b
- Document Type :
- article