Few-boson tunneling in a double well with spatially modulated interaction

TL;DR

This paper investigates how spatially modulated interactions affect tunneling dynamics of few bosons in a double well, revealing regimes from Rabi oscillations to fermionization and tunneling resonances.

Contribution

It introduces the study of spatially inhomogeneous interactions in few-boson tunneling, showing new dynamical regimes and resonance phenomena not previously explored.

Findings

Tunneling dynamics transition from Rabi oscillations to suppressed tunneling and revival.

Observation of tunneling between higher bands under strong interaction inhomogeneity.

Tuning interaction inhomogeneity induces tunneling resonances for N > 2.

Abstract

We study few-boson tunneling in a one-dimensional double well with a spatially modulated interaction. The dynamics changes from Rabi oscillations in the non-interacting case to a highly suppressed tunneling for intermediate coupling strengths followed by a revival near the fermionization limit. With extreme interaction inhomogeneity in the regime of strong correlations we observe tunneling between the higher bands. The dynamics is explained on the basis of the few-body spectrum and stationary eigenstates. For higher number of particles, N > 2, it is shown that the inhomogeneity of the interaction can be tuned to generate tunneling resonances. Finally, a tilted double-well and its interplay with the interaction asymmetry is discussed.