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Title: Heat transport in harmonic lattices
Authors: Dhar, Abhishek
Roy, Dibyendu
Keywords: Harmonic crystal
quantum Langevin equations
non-equilibrium Green’s function
Fourier’s law
Issue Date: Nov-2006
Publisher: Springer
Citation: Journal of Statistical Physics, 2006, Vol.125, p801-820
Abstract: We work out the non-equilibrium steady state properties of a harmonic lattice which is connected to heat reservoirs at different temperatures. The heat reservoirs are themselves modeled as harmonic systems. Our approach is to write quantum Langevin equations for the system and solve these to obtain steady state properties such as currents and other second moments involving the position and momentum operators. The resulting expressions will be seen to be similar in form to results obtained for electronic transport using the non-equilibrium Green’s function formalism. As an application of the formalism we discuss heat conduction in a harmonic chain connected to self-consistent reservoirs. We obtain a temperature dependent thermal conductivity which, in the high-temperature classical limit, reproduces the exact result on this model obtained recently by Bonetto, Lebowitz and Lukkarinen.
Description: Restricted Access. An open access version is available at
ISSN: 0022-4715
1572-9613 (Online)
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Copyright: 2006 by Springer
Appears in Collections:Research Papers (TP)

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