Anomalous buoyancy of quantum bubbles in immiscible Bose mixtures

authored by: Daniel Edler, L. A. Peña Ardila, Cesar R. Cabrera, Luis Santos
Abstract: Buoyancy is a well-known effect in immiscible binary Bose-Einstein condensates. Depending on the differential confinement experienced by the two components, a bubble of one component sitting at the center of the other eventually floats to the surface, around which it spreads either totally or partially. We discuss how quantum fluctuations may significantly change the volume and position of immiscible bubbles. We consider the particular case of two miscible components, forming a pseudo-scalar bubble condensate with enhanced quantum fluctuations (quantum bubble), immersed in a bath provided by a third component, with which they are immiscible. We show that in such a peculiar effective binary mixture, quantum fluctuations change the equilibrium of pressures that define the bubble volume and modify as well the criterion for buoyancy. Once buoyancy sets in, in contrast to the mean-field case, quantum fluctuations may place the bubble at an intermediate position between the center and the surface. At the surface, the quantum bubble may transition into a floating self-bound droplet.
Organisation(s): Institute of Theoretical Physics
QuantumFrontiers
External Organisation(s): Ludwig-Maximilians-Universität München (LMU)
Munich Center for Quantum Science and Technology (MCQST)
Max Planck Institute of Quantum Optics (MPQ)
Type: Article
Journal: Physical Review Research
Volume: 4
ISSN: 2643-1564
Publication date: 11.07.2022
Publication status: Published
ASJC Scopus subject areas: General Physics and Astronomy
Electronic version(s): https://doi.org/10.1103/PhysRevResearch.4.033017 (Access: Open)
https://doi.org/10.1103/PhysRevResearch.4.033017 (Access: Open)

BibTeX

@article{be80aa320c374f2cbd9d4480e913d0d7,
title = "Anomalous buoyancy of quantum bubbles in immiscible Bose mixtures",
abstract = " Buoyancy is a well-known effect in immiscible binary Bose-Einstein condensates. Depending on the differential confinement experienced by the two components, a bubble of one component sitting at the center of the other eventually floats to the surface, around which it spreads either totally or partially. We discuss how quantum fluctuations may significantly change the volume and position of immiscible bubbles. We consider the particular case of two miscible components, forming a pseudo-scalar bubble condensate with enhanced quantum fluctuations (quantum bubble), immersed in a bath provided by a third component, with which they are immiscible. We show that in such a peculiar effective binary mixture, quantum fluctuations change the equilibrium of pressures that define the bubble volume and modify as well the criterion for buoyancy. Once buoyancy sets in, in contrast to the mean-field case, quantum fluctuations may place the bubble at an intermediate position between the center and the surface. At the surface, the quantum bubble may transition into a floating self-bound droplet. ",
keywords = "cond-mat.quant-gas",
author = "Daniel Edler and Ardila, {L. A. Pe{\~n}a} and Cabrera, {Cesar R.} and Luis Santos",
note = "We acknowledge support of the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany{\textquoteright}s Excellence Strategy EXC-2123 Quantum Frontiers No. 390837967 and No. FOR 2247. C.R.C. has received funding from the European Union{\textquoteright}s Horizon 2020 research and innovation programme under the Marie Sk{\l}odowskaCurie Grant Agreement No. 897142.",
year = "2022",
month = jul,
day = "11",
doi = "10.1103/PhysRevResearch.4.033017",
language = "English",
volume = "4",
journal = "Physical Review Research",
issn = "2643-1564",
publisher = "American Physical Society",
number = "3",
}