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Recent studies have revealed that the symmetry of interparticle potentialplays an important role in one-dimensional heat conduction problem. Here wedemonstrate that by stretching or compressing the Fermi-Pasta-Ulam-\b{eta}lattice, one can control the symmetry of the potential, and thus manipulate thedecaying behavior of the heat current autocorrelation function (HCAF). In fact,stretching or compressing induces a fast decaying stage (FDS) during which theHCAF decays faster than power-law manners or in a power law manner but fasterthan ~t -1. The time range as well as the decay amplitude of the HCAF over theFDS increase as the stretching or compressing ratio increase, or as thetemperature decreases. As a consequence, the thermal conductivity calculatedfollowing the Green-Kubo formula shows a truncation-time independent window,implying a system-size independent conductivity. Stretching or compressing alsochanges the exponent of the power-law tail of the HCAF. The complicated heatconduction behavior induced by stretching or compressing can be connected tothe change of the symmetry of the interparticle potential.

Modulating heat conduction by stretching or compressing