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The effect of the presence and absence of DM and KSEA interactions in a quantum stirling heat engine based on a spin XXZ working medium

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  • Tang, Shengju
  • Pan, Zhang
  • Wei, Bowen

Abstract

The thermodynamic behavior of a two spin-1/2 XXZ Heisenberg system under an external magnetic field, incorporating Dzyaloshinskii-Moriya (DM) and Kaplan-Shekhtman-Entin-Wohlman-Aharony (KSEA) interactions along the z-axis, is investigated. The dynamics of the two-qubit system are analyzed in terms of entropy, mean energy, and heat-work exchange under varying temperatures and magnetic fields. Entropy exhibits an exponential rise with temperature, saturating at 1.36 J/K, while stronger magnetic fields delay this saturation due to enhanced spin polarization. The mean energy increases with temperature before stabilizing, with higher magnetic fields elevating the saturation energy via the Zeeman effect. Non-monotonic energy variations with magnetic field strength arise from competing thermal and magnetic ordering effects. The system operates as a heat engine, refrigerator, or heater depending on the Heisenberg exchange interaction (J), with transitions between operational modes driven by J rather than temperature or DM interactions.

Suggested Citation

  • Tang, Shengju & Pan, Zhang & Wei, Bowen, 2026. "The effect of the presence and absence of DM and KSEA interactions in a quantum stirling heat engine based on a spin XXZ working medium," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 689(C).
    • Handle: RePEc:eee:phsmap:v:689:y:2026:i:c:s0378437126001706
    DOI: 10.1016/j.physa.2026.131434
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