Observation of confinement-induced resonances in a 3D lattice

TL;DR

This paper reports the experimental observation of confinement-induced resonances in a three-dimensional lattice, demonstrating a universal behavior and opening new avenues for interaction control and molecule formation in strongly confined quantum systems.

Contribution

It provides the first observation of confinement-induced resonances in 3D lattice confinement and introduces models predicting resonance positions, extending the phenomenon to all dimensionalities.

Findings

Resonance features detected at specific confinement lengths and scattering lengths.

Models based on center-of-mass and relative motion coupling predict resonance positions.

Results suggest a universal behavior of confinement-induced resonances in 3D.

Abstract

We report on the observation of confinement-induced resonances for strong three-dimensional (3D) confinement in a lattice potential. Starting from a Mott-insulator state with predominantly single-site occupancy, we detect loss and heating features at specific values for the confinement length and the 3D scattering length. Two independent models, based on the coupling between the center-of-mass and the relative motion of the particles as mediated by the lattice, predict the resonance positions to a good approximation, suggesting a universal behavior. Our results extend confinement-induced resonances to any dimensionality and open up an alternative method for interaction tuning and controlled molecule formation under strong 3D confinement.