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Heat current magnification in classical and quantum spin networks.

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Heat current magnification (CM) is achieved in quantum spin systems by simply altering the number of spins. Classical systems require additional asymmetry, like varied spin interactions, to achieve CM.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Thermodynamics
  • Statistical Mechanics

Background:

  • Heat current magnification (CM) is a phenomenon where heat flow is amplified.
  • Investigating CM in spin systems provides insights into energy transport and thermodynamic properties.
  • Asymmetry in physical systems can lead to non-intuitive transport phenomena.

Purpose of the Study:

  • To investigate heat current magnification (CM) in classical and quantum spin systems.
  • To determine the role of asymmetry, specifically in the number of spins, in achieving CM.
  • To explore the underlying mechanisms and potential applications of CM.

Main Methods:

  • Studied classical Ising-like spin models using Q2R and Creutz cellular automaton dynamics.
  • Extended the study to a quantum system with a modified Heisenberg XXZ interaction, preserving magnetization.
  • Analyzed the impact of asymmetry in spin number and interaction strengths on heat current.

Main Results:

  • In classical systems, asymmetry in spin number alone is insufficient for CM; unequal spin-spin interactions are also required.
  • In quantum systems, asymmetry in the number of spins is sufficient to achieve heat CM.
  • The onset of CM in quantum systems is accompanied by a dip in the total heat current and linked to energy level intersections and population inversion.

Conclusions:

  • Asymmetry plays a crucial role in heat current magnification, with different requirements for classical and quantum spin systems.
  • The observed CM characteristics in quantum systems can be explained by quantum effects like energy level interactions and magnetization trends.
  • Ergotropy analysis supports the findings, offering a thermodynamic perspective on CM.