Spin-dependent Seebeck Effect in Aharonov-Bohm Rings with Rashba and Dresselhaus Spin-orbit Interactions

TL;DR

This paper theoretically explores how spin-dependent thermoelectric effects in Aharonov-Bohm rings are influenced by Rashba and Dresselhaus spin-orbit interactions, magnetic flux, and temperature, revealing conditions for maximizing the effect.

Contribution

It introduces a detailed theoretical analysis of the spin Seebeck effect in mesoscopic rings with combined Rashba and Dresselhaus interactions, highlighting the impact of various parameters.

Findings

Maximum spin Seebeck effect occurs when Rashba and Dresselhaus couplings are slightly different.

Spin Seebeck coefficient is proportional to the slope of energy-dependent transmission.

Temperature and disorder reduce the spin Seebeck coefficient.

Abstract

We theoretically investigate the spin-dependent Seebeck effect in an Aharonov-Bohm mesoscopic ring in the presence of both Rashba and Dresselhaus spin-orbit interactions under magnetic flux perpendicular to the ring. We apply the Green's function method to calculate the spin Seebeck coefficient employing the tight-binding Hamiltonian. It is found that the spin Seebeck coefficient is proportional to the slope of the energy-dependent transmission coefficients. We study the strong dependence of spin Seebeck coefficient on the Fermi energy, magnetic flux, strength of spin-orbit coupling, and temperature. Maximum spin Seebeck coefficients can be obtained when the strengths of Rashba and Dresselhaus spin-orbit couplings are slightly different. The spin Seebeck coefficient can be reduced by increasing temperature and disorder.