Detecting phonons and persistent currents in toroidal Bose-Einstein condensates by means of pattern formation
Authors: Modugno M., Tozzo C., Dalfovo F.
Autors Affiliation: CNR-INFM BEC Center, I-38050 Povo, Trento, Italy; LENS and Dipartimento di Matematica Applicata, Università di Firenze, via Nello Carrara 1, I-50019 Sesto Fiorentino, Italy; Scuola Normale Superiore, I-56126 Pisa, Italy; Dipartimento di Fisica, Università di Trento, I-38050 Povo, Italy
Abstract: We theoretically investigate the dynamic properties of a Bose-Einstein condensate in a toroidal trap. A periodic modulation of the transverse confinement is shown to produce a density pattern due to parametric amplification of phonon pairs. By imaging the density distribution after free expansion one obtains (i) a precise determination of the Bogoliubov spectrum and (ii) a sensitive detection of quantized circulation in the torus. The parametric amplification is also sensitive to thermal and quantum fluctuations.
Journal/Review: PHYSICAL REVIEW A
Volume: 74 (6) Pages from: 061601R-1 to: 061601R-4
KeyWords: Ultracold gasesDOI: 10.1103/PhysRevA.74.061601Citations: 54data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2022-06-19References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here