Electronic properties of topological rough nanowires for thermoelectrical performance



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Estrada Álvarez, Jorge and Díaz García, Elena and Domínguez-Adame Acosta, Francisco (2022) Electronic properties of topological rough nanowires for thermoelectrical performance. Frontiers in physics, 10 . ISSN 2296-424X

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Official URL: http://dx.doi.org/10.3389/fphy.2022.1062038


We study the electronic states in topological nanowires of narrow-gap semiconductors, such as PbTe or SnTe, with rough surfaces, using a continuous two-band model. We calculate the subband structure and identify topological conducting states located at the surface of the nanowire. In addition, a novel approach to study a nanowire with rough surface demonstrates that the topological surface states are mostly confined in the widest areas of the nanowire. This effect leads to a flattening of the subbands, thus raising the effective mass of carriers. Finally, we analyze the thermoelectric properties of the topological nanowires. The reduction of the radius causes a noticeable enhancement of the thermoelectric efficiency due surface phonon scattering, as expected. However, we also observe that the appearance of topological surface states can play a detrimental role, reducing the thermoelectric efficiency. We conclude that, in addition to nanostructuring, the modulation of the radius of the nanowires, which partially suppress the conduction of the surface states, may be a potential strategy to improve the thermoelectric response of narrow-gap semiconductor nanowires.

Item Type:Article
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© 2022 Estrada, Díaz and Domínguez- Adame. Frontiers Media S.A.
This work was supported by the Spanish Ministry of Science and Innovation under Grant PID2019-106820RB-C21.

Uncontrolled Keywords:Lattice thermal-conductivity; Bi_(2)Te_(3) nanowires; Figure; Merit; Transport; Bulk; Thermoelectricity; Nanowires; Topological insulator; Electron states; Rough surface
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:76326
Deposited On:23 Jan 2023 16:41
Last Modified:23 Jan 2023 16:41

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