Dynamical revival of phase coherence in a many-boson system

TL;DR

This paper investigates the quantum dynamics of cold Bose atoms in a double well, revealing phenomena like coherence revival and collapse, and highlighting the transition from multi-particle to single-particle tunneling as interactions increase.

Contribution

It introduces the concept of dynamical revival and collapse of matter wave fields near the superfluid-Mott insulator transition in optical lattices.

Findings

Coherence-decoherence oscillations observed in the system.

Damped multi-particle tunneling at high interaction strength.

Predicted dynamical revival phenomena near phase boundary.

Abstract

We study the quantum dynamics of cold Bose atoms in a double well. It is shown that self-trapping, as well as population oscillations are common phenomena associated to nonlinear interactions. For larger $U/t$, multi-particle tunneling is damped and the quantum dynamics is dominated by the single-particle tunneling. The many-body system can be effectively described in a truncated Fock space. It exhibits coherence-decoherence oscillations in the temporal evolution. We predict a novel phenomenon of dynamical revival and collapse of matter wave fields in optical lattices in regimes near the superfluid-Mott insulator phase boundary.