Probing the hollowing transition of a shell-shaped BEC with collective excitation
Abstract
We investigate the hollowing transition of a shell-shaped Bose-Einstein condensate using collective excitations. The shell is created using an immiscible dual-species BEC mixture, with its hollowness controlled by tuning the repulsive interspecies interaction via a Feshbach resonance. Our results reveal two distinct monopole modes in which the two condensates oscillate either in-phase or out-of-phase. The spectrum of the out-of-phase mode exhibits a non-monotonic dependence on the interspecies interaction, providing a clear signature of the topology change from a filled to a hollow condensate. Furthermore, we find that the critical point of the hollowing transition depends strongly on the number ratio of the two species. Our findings provide a detailed understanding of the topology change in shell-shaped quantum gases and pave the way for future study of quantum many-body phenomena in curved spaces.
Keywords
Cite
@article{arxiv.2503.12318,
title = {Probing the hollowing transition of a shell-shaped BEC with collective excitation},
author = {Zerong Huang and Kai Yuen Lee and Chun Kit Wong and Liyuan Qiu and Bo Yang and Yangqian Yan and Dajun Wang},
journal= {arXiv preprint arXiv:2503.12318},
year = {2025}
}