138 research outputs found
Thermal conductance of the Fermi-Pasta-Ulam chains: Atomic to mesoscopic transition
We demonstrate that in the atomic-scale limit the thermal conductance
of the FPU model and its variants strongly deviates from the
mesoscopic behavior due to the relevance of contact resistance. As a result,
atomic chains follow , where the power law
coefficient is exactly two times larger than the mesoscopic value. We
smoothly interconnect the atomic and mesoscopic limits, and demonstrate that
this turnover behavior takes place in other nonlinear FPU-like models. Our
results are significant for nanoscale applications, manifesting an atomic
thermal conductance with temperature scaling superior to the mesoscopic limit
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