Non-equilibrium dynamics of Bosonic Mott insulators in an electric field

TL;DR

This paper investigates the non-equilibrium behavior of one-dimensional bosonic Mott insulators under a tunable electric field, analyzing quantum critical dynamics and scaling laws relevant for experimental realizations.

Contribution

It provides exact numerical analysis of quantum critical dynamics in bosonic Mott insulators driven across a phase transition, including scaling behavior and experimental implications.

Findings

Residual energy, fidelity, and defect density obey Kibble-Zurek scaling.

Finite-size effects influence the dynamics and scaling laws.

The study suggests experimental tests for the theoretical predictions.

Abstract

We study the non-equilibrium dynamics of one-dimensional Mott insulating bosons in the presence of a tunable effective electric field E which takes the system across a quantum critical point (QCP) separating a disordered and a translation symmetry broken ordered phase. We provide an exact numerical computation of the residual energy Q, the log-fidelity F, the excess defect density D, and the order parameter correlation function for a linear-in-time variation of E with a rate v. We discuss the temporal and spatial variation of these quantities for a range of v and for finite system sizes as relevant to realistic experimental setups [J. Simon et al., Nature 472, 307 (2011)]. We show that in finite-sized systems Q, F, and D obey Kibble-Zurek scaling, and suggest further experiments within this setup to test our theory.