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HomeMaterials Science ForumMaterials Science Forum Vol. 1065A Newly Developed Dispersive Interaction Approach,...

A Newly Developed Dispersive Interaction Approach, DFT-D3, to the Three-Dimensional Topological Host Material Sb₂Te₃

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Abstract:

Antimony Telluride (Sb₂Te₃), a topological insulator is a layered semiconductor material with hexagonal unit cell similar to graphene. The characteristic presence of their conducting edges or surfaces with self-induced protection, promise for remarkable future applications. In this exertion based on the first principle approach, the structural and electronic properties of Sb₂Te₃ compound have been investigated for both without and with spin orbit coupling (SOC). Lattice structure, band structure, total density of states (TDOS), partial density of states (PDOS), energy bands of surface states are determined within Quantum Espresso simulation package. Furthermore, dispersive interactions, induced due to the presence of van-der-Waals forces have also been taken care of. The newly developed method of DFT-D3 has been incorporated for accurate predictions of band gap and lattice parameters. A proficient model, The Slab Model, has been used to observe the presence of single Dirac cone on the surface. To our knowledge, our theoretical investigations are valid and are found to be congruous with the observed data.

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Periodical:

Materials Science Forum (Volume 1065)

Pages:

195-202

DOI:

https://doi.org/10.4028/p-pgnl37

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Online since:

June 2022

Authors:

Nishant Shukla*, Pawan Chetri, Gazi A. Ahmed

Keywords:

DFT, DFT-D3, Dirac Cone, Quintuple Layers, Sb₂Te₃

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© 2022 Trans Tech Publications Ltd. All Rights Reserved

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