Wednesday, July 10, 2013

1307.2409 (Natalia Bedoya et al.)

Computation of the thermal conductivity using classical and quantum
molecular dynamics based methods

Natalia Bedoya, Jean-Louis Barrat, David Rodney
The thermal conductivity of a model for solid argon is investigated using nonequilibrium molecular dynamics methods, as well as the traditional Boltzmann transport equation approach with input from molecular dynamics calculations, both with classical and quantum thermostats. A surprising result is that, at low temperatures, only the classical molecular dynamics technique is in agreement with the experimental data. We argue that this agreement is due to a compensation of errors, and raise the issue of an appropriate method for calculating thermal conductivities at low (below Debye) temperatures.
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