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Characterization of Thermal Transport in One-dimensional Solid Materials
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Quantum versus Classical Thermal Transport at Low Temperatures.

Zhixing Zou1,2, Jiangbin Gong1,2,3, Jiao Wang4,5

  • 1National University of Singapore, Department of Physics, Singapore 117542, Singapore.

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Quantum mechanics alters low-temperature heat transport. Unlike classical models predicting negative differential thermal resistance, quantum simulations show heat current increases monotonically with thermal bias, highlighting quantum effects in nanoscale devices.

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Area of Science:

  • Thermodynamics
  • Quantum Mechanics
  • Condensed Matter Physics

Background:

  • Classical physics predicts negative differential thermal resistance in heat transport.
  • Understanding low-temperature thermal transport is crucial for nanoscale devices.

Purpose of the Study:

  • Investigate the impact of quantum mechanics on heat transport at low temperatures.
  • Compare classical and quantum models for thermal transport phenomena.

Main Methods:

  • Simulations of a paradigmatic model in the classical setting.
  • Quantum treatment using a Lindblad master equation.

Main Results:

  • Classical simulations revealed negative differential thermal resistance.
  • Quantum simulations showed monotonic increase in heat current with thermal bias.
  • A marked divergence between classical and quantum predictions was observed.

Conclusions:

  • Quantum effects fundamentally alter low-temperature thermal transport.
  • Classical predictions are insufficient for nanoscale thermal device design.
  • Quantum mechanics plays a critical role in heat transport phenomena.