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Thermal rectification and negative differential thermal conductance in harmonic chains with nonlinear system-bath
Yi Ming1, Hui-Min Li2, Ze-Jun Ding3
1School of Physics and Material Science, Anhui University, Hefei, Anhui 230601, People's Republic of China.
Physical Review. E
|April 15, 2016
Summary
This study demonstrates thermal rectification and negative differential thermal conductance in harmonic chains by incorporating nonlinear system-bath coupling. The findings reveal how coupling strength influences phonon transport and rectification direction.
Area of Science:
- Condensed Matter Physics
- Statistical Mechanics
- Nanoscale Heat Transfer
Background:
- Understanding heat flow in nanoscale systems is crucial for thermal management.
- Previous studies primarily focused on linear system-bath coupling.
- Recent experiments highlight the importance of nonlinear system-bath interactions.
Purpose of the Study:
- To investigate thermal rectification and negative differential thermal conductance in harmonic chains.
- To explore the effects of nonlinear system-bath coupling on heat transport.
- To analyze the influence of coupling strength on phonon transport mechanisms.
Main Methods:
- Utilized the generalized Caldeira-Leggett model for heat flow analysis.
- Incorporated nonlinear system-bath coupling, deviating from traditional linear models.
- Studied harmonic chains with asymmetric nonlinear couplings.
Main Results:
- Achieved thermal rectification and negative differential thermal conductance with asymmetric nonlinear couplings.
- Observed enhanced heat current under weak linear coupling due to nonlinear-induced multiphonon processes.
- Found that strong linear coupling leads to umklapp processes dominating, suppressing heat current and reversing rectification direction.
Conclusions:
- Nonlinear system-bath coupling is a key factor in realizing thermal rectification and negative differential thermal conductance.
- The strength of linear coupling critically determines the phonon transport mechanisms and the direction of thermal rectification.
- This work provides insights into controlling heat flow at the nanoscale through engineered system-bath interactions.
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