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

Vipul Upadhyay1, M Tahir Naseem2, Rahul Marathe1

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This study explores heat rectification in two-qubit systems using Dzyaloshinskii-Moriya (DM) interactions. Asymmetry, not just DM anisotropy, is crucial for effective quantum thermal rectification.

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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.