Resonant enhancement of particle emission from a parametrically driven condensate in a one-dimensional lattice

TL;DR

This paper studies how periodic modulation of interactions in a 1D Bose-Einstein condensate causes collective excitations that lead to enhanced particle emission, revealing threshold behavior consistent with experiments.

Contribution

It demonstrates the mechanism of resonant particle emission driven by parametric excitation in a lattice condensate, linking collective modes to emission thresholds.

Findings

Particle emission is amplified by collective density oscillations.

Emission rate exhibits a threshold dependence on modulation amplitude.

Results align with recent experimental observations.

Abstract

Motivated by recent experiments, we investigate particle emission from a Bose-Einstein condensate in a one-dimensional lattice, where the interaction strength is periodically modulated. The modulated interactions parametrically excite a collective mode, leading to density oscillations. These collective oscillations in turn drive particle emission. This multistep process amplifies the drive, producing larger particle jets. We find that the amplitude dependence of the emission rate has a characteristic threshold behavior, as seen in experiments.