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Characterization of Thermal Transport in One-dimensional Solid Materials
Published on: January 26, 2014
Thermal conduction in molecular chains: non-Markovian effects.
1Chemical Physics Theory Group, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada. dsegal@chem.utoronto.ca
The Journal of Chemical Physics
|June 17, 2008
Summary
Non-Markovian reservoirs significantly influence heat conduction in molecular chains. Reservoir spectral properties, not just molecular ones, dictate heat current, even surpassing harmonic systems with anharmonic chains.
Area of Science:
- Condensed matter physics
- Thermodynamics
- Materials science
Background:
- Understanding heat conduction in molecular systems is crucial for nanoscale thermal management.
- The influence of reservoir properties on thermal transport is an active area of research.
- Non-Markovian reservoirs introduce complex correlations that can alter system dynamics.
Purpose of the Study:
- To investigate the impact of non-Markovian heat baths on heat conduction in molecular chains.
- To determine how reservoir spectral properties affect the distance dependence of heat current.
- To compare thermal transport in harmonic versus anharmonic molecular chains coupled to non-Markovian reservoirs.
Main Methods:
- Classical molecular dynamics simulations were employed to model heat conduction.
- Short to intermediate size molecular chains were simulated.
- The spectral properties of the heat baths were systematically varied.
Main Results:
- The distance dependence of heat current is strongly influenced by the spectral properties of the heat baths.
- For anharmonic chains, highly correlated reservoirs can lead to heat currents exceeding those in harmonic systems.
- A single-mode heat conduction model successfully reproduced the complex distance dependence observed numerically.
Conclusions:
- Reservoir properties play a critical role in dictating heat conduction in molecular chains, beyond intrinsic molecular characteristics.
- Non-Markovian effects can lead to counterintuitive thermal transport phenomena, such as enhanced conduction in anharmonic systems.
- The developed single-mode model provides a valuable tool for understanding and predicting heat transport in complex thermal bath scenarios.
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