  A double-stranded system, modeled by a Frenkel-Kontorova lattice, is studied
through nonequilibrium molecular dynamics simulations. We have investigated the
thermal conductance influenced by the intra-chain interaction as well as by the
inter-chain interaction. It is found that the intra-chain interaction always
enhance the thermal conductance. The inter-chain interaction, however, has a
positive effect on the thermal conductance in the case of strong nonlinear
potential, and has a negative effect on the thermal conductance in the case of
weak nonlinear potential. This phenomenon can be explained by the transition of
thermal transport mode and the phonon band shift of the particles. It is
suggested that the inter-and intra-chain interactions present different thermal
properties in double-stranded lattices.
