Ultracold dipolar few-boson ensembles in a triple well trap

TL;DR

This paper explores the ground state and tunneling behaviors of ultracold dipolar bosons in a triple well trap, revealing unique localization, fragmentation, and resonant tunneling phenomena due to dipolar interactions.

Contribution

It provides an ab-initio analysis of dipolar bosons in a triple well, highlighting their distinctive localization, fragmentation, and inter-band resonant tunneling effects compared to contact interactions.

Findings

Intra-well localization occurs at strong dipolar interactions.

Population rearrangement and fragmentation depend on particle number.

Avoided crossings in the energy spectrum lead to resonant tunneling.

Abstract

We investigate the ground state properties and tunneling dynamics of ultracold dipolar bosons in a one dimensional triple well trap from a few-body ab-initio perspective. Our focus is primarily on the distinctive features of dipolar bosons compared to the contact interacting bosons. Formation of intra-well localization is observed for very strong dipolar interaction. General population rearangement as well as fragmentation and localization effects have been found, depending strongly on the particle number. The energy spectrum for two particles exhibits avoided crossings that lead to several distinct resonances involving different bands, i.e. to an inter-band resonant tunneling dynamics. The corresponding mechanisms are investigated by studying among others the pair-probability and performing an eigenstate analysis.