Edge states and size effect on the enhancement of thermoelectric properties in topological materials.
Lukas P. A. Krisna, Jyesta M. Adhidewata, Eddwi H. Hasdeo, Ahmad R. T. Nugraha, Bobby E. Gunara

Theoretical High Energy Physics and Instrumentation Research Group, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung

Research Center for Physics, Indonesian Insitute of Sciences (LIPI)

Abstract

The efficiency of a thermoelectric material to be used as a heat machine is characterized by its thermoelectric figure of merit ((ZT)). The figure of merit itself is dependent on three transport quantities: (1) electrical conductivity ((sigma)), (2) Seebeck coefficient or thermoelectric power ((S)), and (3) electrical thermal conductivity ((kappa_e)). The three quantities are calculated through Boltzmann transport theory using constant and inverse-density of state relaxation time approximation. In this paper, we investigate the thermoelectric properties of various width of ribbon system containing topological edge states. These systems are discussed here due to its unique nature for having both insulating states inside the ribbon and conducting states at the edge which is topologically protected. The width of the ribbon depends on the number of one-dimensional wire stacking. We seek to determine the enhancement effect of manipulating this quantity on thermoelectric properties of the ribbon system and compare it to the conventional bulk system on two-dimensional semiconductors.

Keywords: edge states, ribbon system, topological materials, thermoelectric properties

Topic: Condensed Matter Physics

Link: https://ifory.id/abstract-plain/rNumhCp3ngjF

Web Format | Corresponding Author (Lukas Primahatva Adhitya Krisna)