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Area of Science:

  • Quantum Thermodynamics
  • Solid-State Physics
  • Nanotechnology

Background:

  • Building upon nonlocal thermodynamic engine concepts, this work investigates a triple quantum dot system.
  • The system is a derivative of earlier quadruple quantum dot designs for heat harvesting.

Purpose of the Study:

  • To analyze the cooling performance and operating regime of a triple quantum dot nonlocal refrigeration system.
  • To identify key operational parameters and limitations for efficient cryogenic cooling.

Main Methods:

  • Utilizing the quantum master equation approach to model the system's behavior.
  • Investigating the relationship between applied voltage, reservoir temperature, and cooling power.

Main Results:

  • Maximum cooling power is limited to approximately 70% of optimal design.
  • A threshold voltage (V_{TH}) is required for sub-average temperature cooling, increasing as target temperature decreases.
  • Cooling power and coefficient of performance decline at lower target reservoir temperatures.

Conclusions:

  • The triple quantum dot system demonstrates practical potential for nonlocal cryogenic refrigeration.
  • Fabrication simplicity combined with effective cooling power makes this system promising for future applications.