A stochastic model of anomalous heat transport

analytical solution of the steady state

S. Lepri, C. Mejia-Monasterio, A. Politi

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

We consider a one-dimensional harmonic crystal with conservative noise, in contact with two stochastic Langevin heat baths at different temperatures. The noise term consists of collisions between neighbouring oscillators that exchange their momenta, with a rate gamma. The stationary equations for the covariance matrix are exactly solved in the thermodynamic limit (N -> infinity). In particular, we derive an analytical expression for the temperature profile, which turns out to be independent of gamma. Moreover, we obtain an exact expression for the leading term of the energy current, which scales as 1/root gamma N. Our theoretical results are finally found to be consistent with the numerical solutions of the covariance matrix for finite N.

Original languageEnglish
Article number025001
Number of pages15
JournalJournal of Physics. A, Mathematical and theoretical
Volume42
Issue number2
DOIs
Publication statusPublished - 16 Jan 2009

Keywords

  • harmonic crystal
  • fouriers law
  • conduction
  • lattices
  • reservoirs

Cite this

A stochastic model of anomalous heat transport : analytical solution of the steady state. / Lepri, S.; Mejia-Monasterio, C.; Politi, A.

In: Journal of Physics. A, Mathematical and theoretical, Vol. 42, No. 2, 025001, 16.01.2009.

Research output: Contribution to journalArticle

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AB - We consider a one-dimensional harmonic crystal with conservative noise, in contact with two stochastic Langevin heat baths at different temperatures. The noise term consists of collisions between neighbouring oscillators that exchange their momenta, with a rate gamma. The stationary equations for the covariance matrix are exactly solved in the thermodynamic limit (N -> infinity). In particular, we derive an analytical expression for the temperature profile, which turns out to be independent of gamma. Moreover, we obtain an exact expression for the leading term of the energy current, which scales as 1/root gamma N. Our theoretical results are finally found to be consistent with the numerical solutions of the covariance matrix for finite N.

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KW - lattices

KW - reservoirs

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