Temperature dependence of thermal conductivities of coupled rotator lattice and the momentum diffusion in standard map

Yunyun Li, Nianbei Li, Baowen Li

In contrary to other 1D momentum-conserving lattices such as the Fermi-Pasta-Ulam $\beta$ (FPU-$\beta$) lattice, the 1D coupled rotator lattice is a notable exception which conserves total…