Year: 2022
Type: article
Abstract: The project deals with a thorough analysis of thermoelectric phenomenon in a magnetic helix possessing long range hopping (LRH) interactions. The magnetic helix is subjected to a circularly polarized light irradiation which plays the central role in our analysis. Simulating the quantum system within a Tight-binding framework, we evaluate all the thermoelectric quantities using Landauer prescription, and the two-terminal transmission probabilities are determined following the robust Green’s function technique. The effect of irradiation is incorporated following Bloch-Floquet prescription using minimal coupling scheme through the hopping term. Quite interestingly we find that, electrical conductance as well as thermopower increases significantly at some typical Fermi energies whereas the thermal conductance due to electrons gets reduced at these energies, resulting a large figure of merit. The underlying physical mechanism of achieving large figure of merit (ZT ~ 4) relies on the asymmetric transmission function in such a LRH magnetic helix which is further enhanced in presence of light irradiation. In presence of the spin-dependent scattering, the up and down spin energy channels gets separated which leads to several interesting features in thermoelectric phenomena. Our analysis might be helpful in studying thermoelectric behaviour in different kinds of helical geometries and similar kind of fascinating systems having long range hopping interactions.
Author: Moumita Dey
Institution: Adamas University
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W4290851806