Spin-orbit coupling effects on thermoelectric transport properties in quantum dots

Manya M.A.; Martins G.B.; Figueira M.S. · Physical Review B (2022) · DOI: 10.1103/physrevb.105.165421

Resumen

We study the effects caused by Rashba and Dresselhaus spin-orbit coupling over the thermoelectric transport properties of a single-electron transistor, viz., a quantum dot connected to one-dimensional leads. Using linear response theory and employing the numerical renormalization group method, we calculate the thermopower, electrical and thermal conductances, dimensionless thermoelectric figure of merit, and study the Wiedemann-Franz law, showing their temperature maps. In the Kondo regime, the effect of spin-orbit coupling on those properties appears as a downward renormalization of the Kondo scale. We show that the thermoelectric transport properties, in the presence of spin-orbit coupling, obey the expected universality of the Kondo strong coupling fixed point. In addition, our results show a notable increase in the thermoelectric figure of merit, caused by the spin-orbit coupling in the one-dimensional quantum dot leads. We also provide simulations of the thermocurrent through a quantum dot in good agreement with experimental results.

Instituciones: Universidad Nacional de San Agustín de Arequipa