Probing the hollowing transition of a shell-shaped BEC with collective excitation

• URL: http://arxiv.org/abs/2503.12318v1
• Date: Sun, 16 Mar 2025 02:00:08 GMT
• Title: Probing the hollowing transition of a shell-shaped BEC with collective excitation
• Authors: Zerong Huang, Kai Yuen Lee, Chun Kit Wong, Liyuan Qiu, Bo Yang, Yangqian Yan, Dajun Wang,
• Abstract summary: We investigate the hollowing transition of a shell-shaped Bose-Einstein condensate using collective excitations.<n>Our results reveal two distinct monopole modes in which the two condensates oscillate either in-phase or out-of-phase.
• Score: 2.409872377103135
• License: http://creativecommons.org/licenses/by/4.0/
• 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.

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