Transport in perturbed integrable anharmonic chains

by Stefano Lepri (CNR, Istituto dei Sistemi Complessi,Fi)

Wednesday 17 Feb 2021, 14:30 → 16:00 Europe/Rome

Nonequilibrium and thermal transport properties of classical integrable 1D
systems like the Toda chain or the hard point gas, subject to additional
(nonintegrable) terms are considered. For energy and momentum-conserving
weak perturbations, heat transport is mostly supplied by quasiparticles
with a very large mean free path l. Upon increasing the system size L,
three different regimes can be observed: a ballistic one, an intermediate
diffusive range, and, eventually, the crossover to the anomalous
(hydrodynamic) regime. We discuss the case of the perturbed harmonic chain, which exhibits a yet different scenario.

Link per il collegamento: https://meet.google.com/pip-kvzt-fkz