  We study interface thermal resistance (ITR) in a system consisting of two
dissimilar anharmonic lattices exemplified by Fermi-Pasta-Ulam (FPU) model and
Frenkel-Kontorova (FK) model. It is found that the ITR is asymmetric, namely,
it depends on how the temperature gradient is applied. The dependence of the
ITR on the coupling constant, temperature, temperature difference, and system
size are studied. Possible applications in nanoscale heat management and
control are discussed.
