Interaction-induced Drude weight enhancement in frustrated systems

TL;DR

This paper explores how next nearest-neighbour hopping and interactions influence the Drude weight in one-dimensional systems, revealing an interaction-induced enhancement due to frustration effects.

Contribution

It demonstrates a novel interaction-induced enhancement of the Drude weight in frustrated systems, highlighting the role of kinetic frustration and repulsive interactions.

Findings

Interaction-induced Drude weight enhancement observed

Non-monotonic behavior of Drude weight with interaction strength

Charge density wave fluctuations lead to Drude weight suppression at high interactions

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.