Time-Dependent Thermopower Effect in an Interacting Quantum Dot

TL;DR

This paper investigates how time-dependent gate voltages and magnetic fields affect thermopower in an interacting quantum dot, revealing that interactions reduce thermopower despite voltage-induced enhancements.

Contribution

It provides formal expressions for conductances and thermopower in a quantum dot under time-dependent and magnetic influences, advancing understanding of thermoelectric effects in such systems.

Findings

Time-dependent gate voltage enhances the Seebeck coefficient.

Electron-electron interactions significantly reduce thermopower.

Magnetic field influences displacement and heat currents.

Abstract

The time-dependent thermopower is analyzed through an interacting quantum dot coupled to a time-dependent gate voltage and under the influence of an external magnetic field using the Keldysh nonequilibrium Green's function formalism. Formal expressions of the electrical and thermal conductances, thermopower, and thermoelectrical figure of merit are obtained. The influence of the magnetic field on the displacement current and the heat current is studied. Results show that although applying time-dependent gate voltage results in the enhancement of the Seebeck coefficient, the electron-electron interaction gives rise to a significant reduction in the thermopower. The reason for why applying time dependent gate voltage results in the enhancement of the thermopower is also analyzed.