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Optimal conditions for environment-assisted quantum transport on the fully connected network
Sam Alterman1, Justin Berman1, Frederick W Strauch1
1Department of Physics, Williams College, Williamstown, Massachusetts 01267, USA.
Physical Review. E
|February 17, 2024
Summary
We theoretically analyzed excitation transport on a complete graph network. Dephasing can enhance transport, revealing optimal conditions similar to light-harvesting complexes.
Area of Science:
- Theoretical physics
- Quantum dynamics
- Complex networks
Background:
- Excitation transport is crucial in natural and artificial systems.
- Understanding transport dynamics in complex networks is challenging.
- Light-harvesting complexes offer a biological model for efficient energy transfer.
Purpose of the Study:
- To theoretically analyze excitation transport efficiency and rate.
- To investigate the role of dephasing and excitation decay.
- To identify optimal conditions for transport in a complete graph network.
Main Methods:
- Analytical calculation of long-time transport properties.
- Modeling networks as complete graphs with a single trapping site.
- Inclusion of dephasing and excitation decay effects.
- Analysis of systems with varying initial states.
Main Results:
- Identified conditions where dephasing enhances excitation transport.
- Determined optimal transport conditions for various physical parameters.
- Demonstrated robustness of optimal conditions.
- Observed convergence of timescales with light-harvesting complexes.
Conclusions:
- Dephasing can be beneficial for excitation transport efficiency.
- Optimal transport conditions are robust and exhibit timescale convergence.
- The complete graph model provides insights applicable to light-harvesting systems.
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