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Enhancement of anisotropic thermoelectric power factor of topological crystalline insulator SnTe and related alloys via external perturbations

Abstract

Topological crystalline insulators (TCI) possesses linearly dispersed metallic surface states, which are protected by crystal group point symmetries. The ability to fine-tune effective mass of surface Dirac fermions by breaking the crystalline symmetry is highly desirable for thermoelectric applications. Given that the signatures of SnTe (001) and its family TCIs originate from the (001) surface states, a natural question is: how does the thermoelectric performance of these states change due to the emergence of massive Dirac fermions? Herein, various physical perturbations, subjects of lively discussions, have been uncovered to improve the thermoelectric power factor (PF) of SnTe (001) and related alloys. Further, orientation-dependent charge and heat currents are explored in details. The surface-state Onsager transport calculations are performed by the Kubo- Greenwood approach. Highly dispersive and degenerated energy bands originating from the band gap opening are responsible for the enhancement of PF. While the x-direction is contributed mostly to the PF of the system, we report exceptionally 74.65%, 121.67% and 110% enhancement of PF compared with the pristine case at temperature 540 K when we perturb the crystalline mirror symmetry by strain, exchange field (stemming from the proximity coupling to a ferromagnet, or the electric field, or Zeeman magnetic field) and Rashba spin-orbit coupling, respectively. The predicted PFs propose a new research direction to the experimentalists to save time and to focus only on the thermal conductivity of SnTe (001) to achieve the highest thermoelectric efficienc

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Publication details

The article was received on 25 Jul 2019, accepted on 29 Sep 2019 and first published on 30 Sep 2019


Article type: Paper
DOI: 10.1039/C9TA08100C
J. Mater. Chem. A, 2019, Accepted Manuscript

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    Enhancement of anisotropic thermoelectric power factor of topological crystalline insulator SnTe and related alloys via external perturbations

    M. Yarmohammadi and K. Mirabbaszadeh, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C9TA08100C

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