Heat rectification by two qubits coupled with Dzyaloshinskii-Moriya interaction.

Area of Science:

• Quantum Thermodynamics
• Condensed Matter Physics
• Quantum Information Science

Background:

• Heat rectification, the directional flow of heat, is crucial for thermal management in nanoscale devices.
• Quantum systems offer novel mechanisms for controlling heat transport.
• The Dzyaloshinskii-Moriya (DM) interaction is a key feature in certain magnetic systems.

Purpose of the Study:

• To investigate heat rectification in a two-qubit system coupled via the DM interaction.
• To identify the necessary conditions and physical mechanisms for achieving significant thermal rectification.
• To explore the role of quantum correlations in the performance of a quantum thermal rectifier.

Main Methods:

• Derivation of analytical expressions for heat currents and rectification factors.
• Utilizing a global master equation approach for system analysis.
• Employing off-resonant qubits to introduce asymmetry.
• Analyzing the influence of DM field anisotropy and quantum coherences.

Main Results:

• The anisotropy of the DM interaction alone is insufficient for heat rectification; additional asymmetry is required.
• Off-resonant qubits serve as a viable source of asymmetry for rectification.
• Rectification direction and quality can be tuned by system parameters.
• Asymmetry in quantum coherences is identified as a fundamental resource for rectifier performance.

Conclusions:

• Effective quantum thermal rectification necessitates a combination of DM interaction and other forms of asymmetry.
• Quantum correlations, specifically coherence asymmetry, play a vital role in enhancing rectifier efficiency.
• The findings provide insights into designing advanced quantum thermal devices.