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Dynamic phases of synthetic bath at negative temperatures
Guo-Hao Xu1, Jiarui Zeng2, Yao Yao3
1Department of Physics, South China University of Technology, Guangzhou 510640, China.
The Journal of Chemical Physics
|April 22, 2025
Summary
This study shows a quantum thermal device model can function as a heat engine, refrigerator, or accelerator. Modulating its synthetic bath enables diverse energy transfer modes, including work extraction from cold to hot baths.
Area of Science:
- Quantum Thermodynamics
- Molecular Quantum Devices
- Non-Equilibrium Quantum Systems
Background:
- Quantum thermal devices leverage quantum coherence for enhanced work extraction.
- Understanding non-equilibrium quantum thermodynamics is crucial for realistic device design.
Purpose of the Study:
- To investigate a molecular model for quantum thermal devices with donor-acceptor coupling.
- To explore diverse functionalities including heat engine, refrigerator, and thermal accelerator modes.
- To analyze the impact of external driving fields and synthetic bath modulation on energy transfer.
Main Methods:
- Utilized an energy-carrying molecular model coupled to two physical baths and an external driving field.
- Investigated the role of the counter-rotating component of the driving field.
- Analyzed non-equilibrium quantum thermodynamics under periodic switching of the external driving field.
Main Results:
- Demonstrated that the molecular model can perform diverse functions by transforming among heat engine, refrigerator, and thermal accelerator modes.
- Showcased that the counter-rotating driving field component induces heat flow from cold to hot baths with work output.
- Confirmed that precise modulation of the synthetic bath, with continuously varying inverse temperature, enables all energy transfer modes.
Conclusions:
- The proposed quantum thermal device model offers versatile functionalities through controlled bath modulation and driving fields.
- This research provides insights into non-equilibrium quantum thermodynamics for practical quantum device applications.
- The ability to switch between different operational modes highlights the potential for advanced quantum thermal management.
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