Nonlinear heat transport in ferromagnetic-quantum dot-superconducting systems

TL;DR

This paper investigates nonlinear heat transport in a hybrid ferromagnetic-quantum dot-superconducting system, revealing tunable diode effects and rectification properties relevant for thermal device applications.

Contribution

It introduces a detailed analysis of heat flow and rectification in a ferromagnetic-quantum dot-superconductor setup, highlighting tunable thermal diode effects.

Findings

Heat current exhibits rectification depending on gate potential.

Thermal diode effect shows large asymmetry ratios.

Magnetic fields and spin polarization can tune heat flow asymmetry.

Abstract

We analyze the heat current traversing a quantum dot sandwiched between a ferromagnetic and a superconducting electrode. The heat flow generated in response to a voltage bias presents rectification as a function of the gate potential applied to the quantum dot. Remarkably, in the thermally driven case the heat shows a strong diode effect with large asymmetry ratios that can be externally tuned with magnetic fields or spin-polarized tunneling. Our results thus demonstrate the importance of hybrid systems as promising candidates for thermal applications.