Paper on the hollowing transition has been accepted by PRR

Our work on the Probing the hollowing transition of a shell-shaped BEC with collective excitation has been accepted by Physical Review Research.

While the miscible-immiscible transition for dual-species Bose-Einstein condensates is well-established in free space and has been measured in elongated traps, the behavior in spherically harmonic traps is markedly different. Due to the finite size of spherical traps, the transition becomes phase-transition-like, and the phase boundary for the interacting species’ scattering length differs drastically from the conventional miscible-immiscible transition. In this collaborative work with Dajun Wang’s experimental group at CUHK, we measured both in-phase and out-of-phase breathing modes. Due to spherical symmetry, these two modes completely decouple, and we found that the transition boundary occurs precisely at the local minimum of the out-of-phase breathing frequency.

Group member Kai-Yuen Lee is one of the co-first authors.