Title:	Linear-response formula for finite-frequency thermal conductance of open systems
Authors:	Dhar, Abhishek Narayan, Onuttom Kundu, Anupam Saito, Keiji
Issue Date:	3-Jan-2011
Publisher:	American Physical Society
Citation:	Physical Review E, 2010, Vol.83, p011101
Abstract:	An exact linear-response expression is obtained for the heat current in a classical Hamiltonian system coupled to heat baths with time-dependent temperatures. The expression is equally valid at zero and finite frequencies. We present numerical results on the frequency dependence of the response function for three different one-dimensional models of coupled oscillators connected to Langevin baths with oscillating temperatures. For momentum conserving systems, a low-frequency peak is seen that is higher than the zero-frequency response for large systems. For momentum nonconserving systems, there is no low-frequency peak. The momentum nonconserving system is expected to satisfy Fourier’s law; however, at the single bond level, we do not see any clear agreement with the predictions of the diffusion equation even at low frequencies. We also derive an exact analytical expression for the response of a chain of harmonic oscillators to a (not necessarily small) temperature difference; the agreement with the linear-response simulation results for the same system is excellent.
Description:	Open Access.
URI:	http://hdl.handle.net/2289/3994
ISSN:	1550-2376 (Online) 1539-3755
Alternative Location:	http://arxiv.org/abs/1008.4687 http://dx.doi.org/10.1103/PhysRevE.83.011101 http://adsabs.harvard.edu/abs/2011PhRvE..83a1101D
Copyright:	2011 American Physical Society
Appears in Collections:	Research Papers (TP)

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