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Quantum mechanics offers unique advantages in thermodynamic cycles. A quantum rotor engine shows potential for both engine and refrigerator modes, outperforming classical models in specific magnetic field applications.

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Area of Science:

  • Quantum thermodynamics
  • Statistical mechanics
  • Condensed matter physics

Background:

  • Thermodynamic cycles like the Otto cycle are fundamental to energy conversion.
  • Quantum effects on working substances in heat engines are an active area of research.
  • Understanding quantum phenomena in macroscopic systems is crucial for novel technologies.

Purpose of the Study:

  • To investigate quantum effects in an Otto cycle using a quantum planar rotor.
  • To compare the performance of quantum and classical rotors as working media.
  • To identify genuine quantum advantages in engine and refrigerator modes.

Main Methods:

  • Modeling an Otto cycle with a quantum planar rotor controlled by external fields.
  • Analyzing two specific realizations: a quantum pendulum (electric dipole) and a charged rotor in a magnetic field.
  • Comparing quantum mechanical descriptions with classical counterparts.

Main Results:

  • The quantum pendulum shows a systematic disadvantage compared to its classical analog.
  • A charged quantum rotor in a magnetic field demonstrates a genuine quantum advantage.
  • The classical rotor is inoperable, while the quantum rotor functions in both engine and refrigerator modes.

Conclusions:

  • Quantum statistics can lead to unique operational modes in thermodynamic cycles.
  • The choice of working medium and control fields significantly impacts quantum engine performance.
  • Quantum rotors offer a promising avenue for developing novel quantum heat engines and refrigerators.