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Nonequilibrium thermal rectification at the junction of harmonic chains
Sergey V Dmitriev1,2, Vitaly A Kuzkin3,4, Anton M Krivtsov3,4
1Institute of Molecule and Crystal Physics, Ufa Federal Research Centre of RAS, Ufa 450054, Russia.
Physical Review. E
|December 20, 2023
Summary
Non-equilibrium energy distribution in harmonic chains creates a thermal diode effect. This heat transfer phenomenon can be optimized for ideal thermal rectification in nanomaterials.
Area of Science:
- Condensed matter physics
- Thermodynamics
- Nanomaterials science
Background:
- A thermal diode or rectifier facilitates directional heat transfer.
- Understanding heat transport in heterogeneous nanomaterials is crucial.
Purpose of the Study:
- Investigate the influence of energy distribution across wave numbers on the diode effect.
- Analyze the junction of two dissimilar harmonic chains.
Main Methods:
- Derivation of an analytical expression for the diode coefficient.
- Analysis of heat flux in two directions across the junction.
Main Results:
- The diode coefficient is dependent on energy distribution among wave numbers.
- Equilibrium energy distribution results in no diode effect.
- Non-equilibrium distributions induce a diode effect in harmonic systems.
Conclusions:
- The diode effect can be maximized by tuning energy distribution and spectral positioning.
- Conditions for an ideal thermal rectifier are established.
- Findings are significant for heat transfer in low-dimensional heterogeneous nanomaterials.
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