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Heat current rectification in segmented XXZ chains.

Vinitha Balachandran1, Giuliano Benenti2,3,4, Emmanuel Pereira5

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This study shows that heat current rectification in a quantum chain is significant with strong interactions and cold baths. Rectification increases with system size, revealing nonlinear thermal transport properties.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Thermodynamics
  • Statistical Mechanics

Background:

  • Understanding thermal transport in quantum systems is crucial for nanoscale devices.
  • Heat current rectification, the directional flow of heat, is a key phenomenon in nonlinear thermal transport.

Purpose of the Study:

  • Investigate heat current rectification in a segmented XXZ quantum chain.
  • Model environmental effects using Lindblad quantum heat baths.
  • Analyze the influence of interactions and temperature on rectification efficiency.

Main Methods:

  • Utilized a theoretical model of a two-part XXZ spin chain.
  • Incorporated Lindblad operators to simulate heat baths.
  • Analyzed steady-state properties and two-time correlations.
  • Performed numerical simulations for accessible system sizes.

Main Results:

  • Achieved significant rectification with strong interactions in one chain segment and a sufficiently cold bath.
  • Observed an increase in rectification with increasing system size.
  • Identified a strong nonlinear response to temperature differences, including superlinear and negative differential conductance.

Conclusions:

  • The XXZ chain system exhibits tunable heat current rectification.
  • Interactions and bath temperatures are critical parameters for controlling rectification.
  • The findings provide insights into nonlinear quantum thermal transport mechanisms.