Normal heat conduction in lattice models with asymmetry harmonic interparticle interactions

TL;DR

This paper demonstrates that asymmetry in harmonic interparticle interactions leads to normal, size-independent heat conduction in one-dimensional lattice models, confirmed through equilibrium and nonequilibrium simulations.

Contribution

It provides clear evidence that asymmetry alone can induce normal thermal conduction in momentum-conserving 1D lattices, resolving ambiguities in previous studies.

Findings

Normal thermal conductivity observed in long chains

Asymmetry is key to normal conduction in harmonic models

Supports conclusions with both equilibrium and nonequilibrium simulations

Abstract

We study the thermal conduction behaviors of one-dimensional lattice models with asymmetry harmonic interparticle interactions in this paper. Normal thermal conductivity independent of the system size is observed when the lattice chains are long enough. Because only the harmonic interactions are involved, the result confirms without ambiguous interpretation that the asymmetry plays key role in resulting in the normal thermal conduction in one-dimensional momentum conserving lattices. Both equilibrium and nonequilibrium simulations are performed to support the conclusion.