Interaction-induced Drude weight enhancement in frustrated systems
Abstract
We investigate the effect of next nearest-neighbour hopping on the zero temperature Drude weight or superfluidity in mesoscopic one-dimensional systems of (a) single particle with quasidisorder (Aubry-Andr\'e model) and (b) hardcore bosons with nearest-neighbour interaction. We show that there is an interaction-induced enhancement of the Drude weight when the next nearest-neighbour hopping is frustrated for the many-body system. The observed non-monotonic behaviour of the Drude weight occurs because the repulsive interactions first suppress the frustration in the system, leading to a rise in the Drude weight, whereas at much larger interaction strengths the charge density wave fluctuations set in the insulator and the Drude weight drops. The present work reveals a novel scenario in which a persistent flow enhancement is plausible in the presence of kinetic frustration and repulsive interactions.
Keywords
Cite
@article{arxiv.1503.06296,
title = {Interaction-induced Drude weight enhancement in frustrated systems},
author = {Vipin Kerala Varma and Ramsés Sánchez},
journal= {arXiv preprint arXiv:1503.06296},
year = {2015}
}
Comments
6 pages, 3 pages, 2 column format (published version)