Quantum Bubbles in Microgravity
Authors: Tononi A, Cinti F., Salasnich L.
Autors Affiliation: Dipartimento di Fisica e Astronomia “Galileo Galilei,” Universit`a di Padova, via Marzolo 8, Padova 35131, Italy; Dipartimento di Fisica e Astronomia, Universit`a di Firenze, I-50019 Sesto Fiorentino (FI), Italy; INFN, Sezione di Firenze, I-50019 Sesto Fiorentino (FI), Italy; Department of Physics, University of Johannesburg, P.O. Box 524, Auckland Park 2006, South Africa; Istituto Nazionale di Ottica (INO) del Consiglio Nazionale delle Ricerche
Abstract: The recent developments of microgravity experiments with ultracold atoms have produced a relevant boost in the study of shell-shaped ellipsoidal Bose-Einstein condensates. For realistic bubble-trap parameters, here we calculate the critical temperature of Bose-Einstein condensation, which, if compared to the one of the bare harmonic trap with the same frequencies, shows a strong reduction. We simulate the zero-temperature density distribution with the Gross-Pitaevskii equation, and we study the free expansion of the hollow condensate. While part of the atoms expands in the outward direction, the condensate self-interferes inside the bubble trap, filling the hole in experimentally observable times. For a mesoscopic number of particles in a strongly interacting regime, for which more refined approaches are needed, we employ quantum Monte Carlo simulations, proving that the nontrivial topology of a thin shell allows superfluidity. Our work constitutes a reliable benchmark for the forthcoming scientific investigations with bubble traps.
Journal/Review: PHYSICAL REVIEW LETTERS
Volume: 125 (1) Pages from: 010402-1 to: 010402-6
KeyWords: Bose-Einstein condensation; ultracold atoms; bubble trapsDOI: 10.1103/PhysRevLett.125.010402Citations: 6data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2021-10-17References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here