FINITE-TEMPERATURE MOBILITY OF A PARTICLE COUPLED TO A FERMIONIC ENVIRONMENT

We study numerically the finite-temperature and frequency mobility of a particle coupled by a local interaction to a system of spinless ferm ions in one dimension. We find that when the model is integrable(parti cle mass equal to the mass of fermions) the static mobility diverges. Further, an enhanced mobility is observed over a finite parameter rang e away from the integrable point. We. present an analysis of the finit e-temperature static-mobility based on a random matrix theory descript ion of the many-body Hamiltonian.