Many-body localization in a quantum gas with long-range interactions and linear external potential

TL;DR

This paper investigates how long-range interactions affect many-body localization in a quantum gas under a linear external potential, showing that Stark localization remains stable even with long-range couplings.

Contribution

It provides a theoretical phase diagram for localization in long-range interacting systems with linear tilt, using numerical methods to analyze stability of Stark localization.

Findings

Stark localization persists with long-range interactions.

Phase diagrams map localized and chaotic regimes.

Numerical simulations confirm stability of localization.

Abstract

We study theoretically transitions between the localized and chaotic many-body regimes in one-dimensional quantum lattice systems with long-range couplings between particles and linear external potential. In terms of established criteria characterizing localization, we construct effective phase diagrams for several types of lattice systems with variable amplitude of the external linear tilt and interaction strength. By means of exact diagonalization and time-dependent variational principle numerical approaches we analyze system dynamics after quenches. Our results reveal that the Stark localization without any artificial source of disorder remains stable upon inclusion of long-range interactions.