Bosonic Quantum Dynamics Following Colliding Potential Wells

TL;DR

This paper uses advanced quantum simulation methods to study the complex non-equilibrium dynamics of two bosons in colliding Gaussian wells, revealing transient structures, transport phenomena, and strong correlations.

Contribution

It introduces a detailed analysis of bosonic quantum dynamics during colliding potential wells using MCTDHB, highlighting new insights into transient states and correlation effects.

Findings

Transient double-well structures form during collisions

Energy transfer causes some bosons to become untrapped

Strong inter-particle correlations are observed despite weak interactions

Abstract

We employ the multi-configuration time-dependent Hartree method for bosons (MCTDHB) in order to investigate the correlated non-equilibrium quantum dynamics of two bosons confined in two colliding and uniformly accelerated Gaussian wells. As the wells approach each other an effective, transient double-well structure is formed. This induces a transient and oscillatory over-barrier transport. We monitor both the amplitude of the intra-well dipole mode in the course of the dynamics as well as the final distribution of the particles between the two wells. For fast collisions we observe an emission process which we attribute to two distinct mechanisms. Energy transfer processes lead to an untrapped fraction of bosons and a resonant enhancement of the deconfinement for certain kinematic configurations can be observed. Despite the comparatively weak interaction strengths employed in this work, we identify strong inter-particle correlations by analyzing the corresponding Von Neumann entropy.