Transient and persistent particle subdiffusion in a disordered chain coupled to bosons
Strongly Correlated Electrons
2018-10-04 v1 Disordered Systems and Neural Networks
Abstract
We consider the propagation of a single particle in a random chain, assisted by the coupling to dispersive bosons. Time evolution treated with rate equations for hopping between localized states reveals a qualitative difference between dynamics due to noninteracting bosons and hard-core bosons. In the first case the transient dynamics is subdiffusive, but multi-boson processes allow for long-time normal diffusion, while hard-core effects suppress multi-boson processes leading to persistent subdiffusive transport, consistent with numerical results for a full many-body evolution. In contrast, analogous study for a quasiperiodic potential reveals a stable long-time diffusion.
Cite
@article{arxiv.1810.01593,
title = {Transient and persistent particle subdiffusion in a disordered chain coupled to bosons},
author = {P. Prelovsek and J. Bonca and M. Mierzejewski},
journal= {arXiv preprint arXiv:1810.01593},
year = {2018}
}