Thermal Rectification in the Nonequilibrium Quantum-Dot-System

TL;DR

This paper investigates thermal rectification in a two-quantum-dot system with Dzyaloshinskii-Moriya interaction, demonstrating controllable rectification sign, high efficiency, and quantum correlations, with potential applications in nanoscale thermal diodes.

Contribution

The study introduces a model showing larger rectification efficiency and polarity control in a small quantum-dot system, advancing thermal diode design.

Findings

Thermal rectification sign can be controlled via energy splitting or DM interaction.

The system exhibits high rectification efficiency compared to previous proposals.

Quantum correlations, including entanglement, are enhanced under large temperature bias.

Abstract

Quantum thermal transport in two-quantum-dot system with Dzyaloshinskii-Moriya interaction (DM interaction) has been studied. The sign of thermal rectification can be controlled through changing the energy splitting or the DM interaction strength. The anisotropic term in the system can also affect the sign of rectification. Compared with other proposals [Phys. Rev. B 80, 172301 (2009)], our model can offer larger rectification efficiency and show the potential application in designing the polarity-controllable thermal diode with a small size system (N=2). Moreover, quantum correlations of two-quantum-dots are investigated. We find that almost perfect quantum correlations can be obtained in the large temperature bias region, and quantum entanglement is more sensitive to the change of the DM interaction strength than quantum discord.