The impact of spatial correlation on the tunneling dynamics of few-boson mixtures in a combined triple well and harmonic trap

TL;DR

This paper explores how spatial correlations influence tunneling behaviors in a two-species bosonic mixture confined in a triple well and harmonic trap, revealing correlation-induced tunneling and control mechanisms.

Contribution

It demonstrates the role of spatial correlations in controlling tunneling dynamics and introduces a mechanism distinct from resonant tunneling in few-boson mixtures.

Findings

Correlation-induced tunneling occurs in weak interspecies interactions.

Spatial correlations can be used to control tunneling properties.

Tunneling via higher band states appears at strong interactions.

Abstract

We investigate the tunneling properties of a two-species few-boson mixture in a one-dimensional triple well and harmonic trap. The mixture is prepared in an initial state with a strong spatial correlation for one species and a complete localization for the other species. We observe a correlation-induced tunneling process in the weak interspecies interaction regime. The onset of the interspecies interaction disturbes the spatial correlation of one species and induces tunneling among the correlated wells. The corresponding tunneling properties can be controlled by the spatial correlations with an underlying mechanism which is inherently different from the well known resonant tunneling process. We also observe the correlated tunneling of both species in the intermediate interspecies interaction regime and the tunneling via higher band states for strong interactions.