TY - JOUR
T1 - Physics of hollow Bose-Einstein condensates
AU - Padavić, Karmela
AU - Sun, Kuei
AU - Lannert, Courtney
AU - Vishveshwara, Smitha
N1 - Funding Information:
ARO (W911NF-12-1-0334), AFOSR (FA9550-13-1-0045), NSF (PHY-1505496), and Texas Advanced Computing Center (TACC). CL acknowledges support by the National Science Foundation under award DMR-1243574. KP, SV, and CL acknowledge support by NASA (SUB JPL 1553869 and 1553885). CL and SV thank the KITP for hospitality.
Funding Information:
We thank Nathan Lundblad and Michael Stone for illuminating discussions. KS acknowledges support by ARO (W911NF-12-1-0334), AFOSR (FA9550-13-1-0045), NSF (PHY-1505496), and Texas Advanced Computing Center (TACC). CL acknowledges support by the National Science Foundation under award DMR-1243574. KP, SV, and CL acknowledge support by NASA (SUB JPL 1553869 and 1553885). CL and SV thank the KITP for hospitality.
Publisher Copyright:
© CopyrightEPLA, 2018.
PY - 2017/10
Y1 - 2017/10
N2 - Bose-Einstein condensate shells, while occurring in ultracold systems of coexisting phases and potentially within neutron stars, have yet to be realized in isolation on Earth due to the experimental challenge of overcoming gravitational sag. Motivated by the expected realization of hollow condensates by the space-based Cold Atomic Laboratory in microgravity conditions, we study a spherical condensate undergoing a topological change from a filled sphere to a hollow shell. We argue that the collective modes of the system show marked and robust signatures of this hollowing transition accompanied by the appearance of a new boundary. In particular, we demonstrate that the frequency spectrum of the breathing modes shows a pronounced depression as it evolves from the filled-sphere limit to the hollowing transition. Furthermore, when the center of the system becomes hollow surface modes show a global restructuring of their spectrum due to the availability of a new, inner, surface for supporting density distortions. We pinpoint universal features of this topological transition as well as analyse the spectral evolution of collective modes in the experimentally relevant case of a bubble-trap.
AB - Bose-Einstein condensate shells, while occurring in ultracold systems of coexisting phases and potentially within neutron stars, have yet to be realized in isolation on Earth due to the experimental challenge of overcoming gravitational sag. Motivated by the expected realization of hollow condensates by the space-based Cold Atomic Laboratory in microgravity conditions, we study a spherical condensate undergoing a topological change from a filled sphere to a hollow shell. We argue that the collective modes of the system show marked and robust signatures of this hollowing transition accompanied by the appearance of a new boundary. In particular, we demonstrate that the frequency spectrum of the breathing modes shows a pronounced depression as it evolves from the filled-sphere limit to the hollowing transition. Furthermore, when the center of the system becomes hollow surface modes show a global restructuring of their spectrum due to the availability of a new, inner, surface for supporting density distortions. We pinpoint universal features of this topological transition as well as analyse the spectral evolution of collective modes in the experimentally relevant case of a bubble-trap.
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U2 - 10.1209/0295-5075/120/20004
DO - 10.1209/0295-5075/120/20004
M3 - Article
AN - SCOPUS:85040952681
SN - 0295-5075
VL - 120
JO - EPL
JF - EPL
IS - 2
M1 - 20004
ER -