Detecting phonons and persistent currents in toroidal Bose-Einstein condensates by means of pattern formation

Year: 2006

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.


Volume: 74 (6)      Pages from: 061601R-1  to: 061601R-4

KeyWords: Ultracold gases
DOI: 10.1103/PhysRevA.74.061601

Citations: 54
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