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Near Field Propulsion Forces from Nonreciprocal Media.

David Gelbwaser-Klimovsky1, Noah Graham2, Mehran Kardar3

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Summary
This summary is machine-generated.

A novel Casimir force engine requires nonreciprocal materials for operation. This setup converts heat radiation into mechanical force, with efficiency limited by Carnot value.

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Area of Science:

  • Thermodynamics
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Casimir forces typically arise from quantum fluctuations.
  • Previous models suggested symmetry and thermodynamics could enable a lateral Casimir force.
  • Broken inversion symmetry is a key factor in Casimir force phenomena.

Purpose of the Study:

  • To investigate the conditions necessary for a ratchetlike lateral Casimir force.
  • To determine if such a force can operate as a heat engine.
  • To analyze the efficiency and operational velocity of this proposed engine.

Main Methods:

  • Theoretical analysis of Casimir forces between plates at different temperatures.
  • Inclusion of nonreciprocal material properties in the theoretical model.
  • Extension of Onsager symmetry principles to nonreciprocal systems.

Main Results:

  • A lateral Casimir force requires at least one nonreciprocal material plate.
  • The setup functions as a heat engine, converting thermal radiation to mechanical force.
  • Engine efficiency is limited to the Carnot value, even with nonreciprocal materials.

Conclusions:

  • Nonreciprocal materials are essential for realizing a lateral Casimir force heat engine.
  • The theoretical framework extends Onsager symmetry to nonreciprocal systems.
  • Optimal operating velocities are dependent on material properties and distance, approaching the speed of light.