Effects of ballistic transport on the thermal resistance and temperature profile in nanowires

Abstract

Effects of ballistic transport on the temperature profiles and thermal resistance in nanowires are studied. Computer simulations of nanowires between a heat source and a heat sink have shown that in the middle of such wires the temperature gradient is reduced compared to Fourier's law with steep gradients close to the heat source and sink. In this work, results from molecular dynamics and phonon Monte Carlo simulations of the heat transport in nanowires are compared to a radiator model which predicts a reduced gradient with discrete jumps at the wire ends. The comparison shows that for wires longer than the typical mean free path of phonons the radiator model is able to account for ballistic transport effects. The steep gradients at the wire ends are then continuous manifestations of the discrete jumps in the model.

arXiv commentThis version of the article has been accepted for publication after peer review but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The version of Record is available online at http://dx.doi.org/10.1140/epjb/s10051-024-00727-y

References in corpus (5)

• Efficient simulation of multidimensional phonon transport using energy-based variance-reduced Monte Carlo formulations
• Monte Carlo transient phonons transport in silicon and germanium at nanoscales
• Influence of Boundaries and Thermostatting on Nonequilibrium Molecular Dynamics Simulations of Heat Conduction in Solids
• Simulation of thermal conductivity and heat transport in solids
• An alternative approach to efficient simulation of micro/nanoscale phonon transport