Momentum interferences of a freely expanding Bose-Einstein condensate in 1D due to interatomic interaction change
A. Ruschhaupt, A. del Campo, and J. G. Muga
TL;DR
This paper investigates how changing interatomic interactions in a 1D Bose-Einstein condensate affects momentum interference patterns during free expansion, revealing a stepwise increase in momentum peaks without significant spatial density change.
Contribution
It demonstrates the impact of interaction switching on momentum interference patterns in a 1D BEC during free expansion, highlighting a novel interference behavior.
Findings
Number of momentum peaks increases sequentially during expansion
Spatial density remains largely unchanged in the short-time regime
Interatomic interaction change induces observable interference effects
Abstract
A Bose-Einstein condensate may be prepared in a highly elongated harmonic trap with negligible interatomic interactions using a Feshbach resonance. If a strong repulsive interatomic interaction is switched on and the axial trap is removed to let the condensate evolve freely in the axial direction, a time dependent quantum interference pattern takes place in the short time (Thomas-Fermi) regime, in which the number of peaks of the momentum distribution increases one by one, whereas the spatial density barely changes.
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