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Exponentially Enhanced Non-Hermitian Cooling.

Haowei Xu1, Uroš Delić2,3, Guoqing Wang1,3

  • 1Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

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|April 2, 2024
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Summary
This summary is machine-generated.

This study introduces non-Hermitian cooling, a novel mechanism that exploits suppressed wave functions in non-Hermitian systems to cool thermal excitations at one edge. The cooling effect is exponentially enhanced by auxiliary modes.

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Area of Science:

  • Condensed matter physics
  • Quantum mechanics
  • Thermodynamics

Background:

  • Non-Hermitian systems can exhibit the skin effect, localizing wave functions at one edge.
  • This localization offers potential for classical and quantum sensing applications.
  • The edge with suppressed wave functions remains largely unexplored.

Purpose of the Study:

  • Introduce a novel non-Hermitian cooling mechanism.
  • Explore the potential of suppressed wave functions for thermal management.
  • Investigate a cooling method distinct from traditional refrigeration or laser cooling.

Main Methods:

  • Leveraging the skin effect in non-Hermitian systems.
  • Redistributing thermal excitations using non-Hermiticity.
  • Analyzing the exponential enhancement of cooling by auxiliary modes.

Main Results:

  • Demonstrated a non-Hermitian cooling mechanism distinct from conventional methods.
  • Showed that thermal excitations are cooled at one edge of the system.
  • Found that cooling can be exponentially enhanced by auxiliary modes, with a lower bound influenced by environmental dissipation.

Conclusions:

  • Non-Hermitian cooling offers a new approach to thermal management in quantum and classical systems.
  • The mechanism does not require exceptional points or nontrivial topology, broadening its applicability.
  • This method can be applied to a wide range of excitations.