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Heat transport through a two-level system embedded between two harmonic resonators.

Tsuyoshi Yamamoto1, Takeo Kato1

  • 1Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|July 8, 2021
PubMed
Summary

We studied heat transport in nanoscale devices using a quantum Rabi model. Results show a unique two-peak temperature dependence for thermal conductance, useful for heat transistors.

Keywords:
circuit-QEDheat transportlinear thermal conductancenoninteracting-blip approximationquantum Rabi model

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Area of Science:

  • Quantum thermodynamics
  • Nanoscale heat devices
  • Quantum optics

Background:

  • Controllable multi-level systems are crucial for developing advanced nanoscale heat devices.
  • The quantum Rabi model provides a framework for understanding quantum systems coupled to baths.

Purpose of the Study:

  • To investigate heat transport in a prototype nanoscale heat device based on the quantum Rabi model.
  • To analyze the temperature dependence of thermal conductance and its sensitivity to system parameters.

Main Methods:

  • Utilizing the noninteracting-blip approximation to model the quantum system.
  • Analyzing the quantum Rabi model describing a two-level system coupled to two harmonic oscillators.

Main Results:

  • Observed a characteristic two-peak structure in the linear thermal conductance's temperature dependence.
  • Demonstrated that heat transport is sensitive to model parameters under weak system-bath coupling and strong hybridization.

Conclusions:

  • The observed properties are advantageous for applications like heat transistors.
  • Experimental examination of these phenomena is feasible in superconducting circuits.