Can I read Nuclear Quantum Effects in Thermal Conductivity from Centroid Molecular Dynamics on EtoBox?

Nuclear Quantum Effects in Thermal Conductivity from Centroid Molecular Dynamics by Benjamin J. Sutherland; William H. D. Moore; David E. Manolopoulos is a Physics and Astronomy article available to read on EtoBox.

What is Nuclear Quantum Effects in Thermal Conductivity from Centroid Molecular Dynamics about?

We show that the centroid molecular dynamics (CMD) method provides a realistic way to calculate the thermal diffusivity a = λ/ρcV of a quantum mechanical liquid such as para-hydrogen. Once a has been calculated, the thermal conductivity can be obtained from λ = ρcVa, where ρ is the density of the liquid and cV is the constant-volume heat capacity. The use of this formula requires an accurate quantum mechanical heat capacity cV, which can be obtained from a path integral molecular dynamics simulation. The thermal diffusivity can be calculated either from the decay of the equilibrium density fluctuations in the liquid or by using the Green–Kubo relation to calculate the CMD approximation to λ and then dividing this by the corresponding approximation to ρcV. We show that both approaches give the same results for liquid para-hydrogen and that these results are in good agreement with the experimental measurements of the thermal conductivity over a wide temperature range. In particular, they correctly predict a decrease in the thermal conductivity at low temperatures—an effect that stems from the decrease in the quantum mechanical heat capacity and has eluded previous para-hydrogen simul

Who reads Nuclear Quantum Effects in Thermal Conductivity from Centroid Molecular Dynamics?

Author

Benjamin J. Sutherland; William H. D. Moore; David E. Manolopoulos

Publisher

AIP Publishing

Published

2021

Language

EN

Field

Physics and Astronomy (Physical Sciences)