Memory effects and heat transport in one-dimensional insulators |
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Authors: | S Lepri |
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Institution: | (1) Dipartimento di Energetica “S. Stecco”, Via Santa Marta 3, 50139 Firenze, Italy and Istituto Nazionale di Fisica della Materia, Unità di Firenze, L.go E. Fermi 2, 50125 Firenze, Italy, IT |
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Abstract: | We study the dynamical correlation functions and heat conduction for the simplest model of quasi one-dimensional (1d) dielectric
crystal i.e. a chain of classical particles coupled by quadratic and cubic intersite potential. Even in the weakly nonlinear regime, numerical
simulation on long enough chains reveal sizeable deviations from the perturbative results in the form of a slower decay of
correlations in equilibrium. Their origin can be traced back to the subtle nonlinear effects described by mode-coupling theories.
Measures of thermal conductivity with nonequilibrium molecular-dynamics method confirm the relevance of such effects for low-dimensional
lattices even at very low temperatures.
Received 20 April 2000 |
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Keywords: | PACS 63 10 +a General theory - 05 60 -k Transport processes - 44 10 +i Heat conduction |
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