Finite thermal conductivity in 1d lattices

Details Finite thermal conductivity in 1d lattices Finite thermal conductivity in 1d lattices

1999-10-17

arxiv.org/abs/chao-dyn/9910023v1

Nonlinear Sciences

Chaotic Dynamics

4 pages, 3 postscript figures

Scientific paper

10.1103/PhysRevLett.84.2144

We discuss the thermal conductivity of a chain of coupled rotators, showing that it is the first example of a 1d nonlinear lattice exhibiting normal transport properties in the absence of an on-site potential. Numerical estimates obtained by simulating a chain in contact with two thermal baths at different temperatures are found to be consistent with those ones based on linear response theory. The dynamics of the Fourier modes provides direct evidence of energy diffusion. The finiteness of the conductivity is traced back to the occurrence of phase-jumps. Our conclusions are confirmed by the analysis of two variants of this model.

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