Effective-range signatures in quasi-1D matter waves: sound velocity and solitons

Year: 2015

Authors: Sgarlata F., Mazzarella G., Salasnich L.

Autors Affiliation: Univ Padua, Dipartimento Fis & Astron Galileo Galilei, I-835131 Padua, Italy;‎ Consorzio Nazl Interuniv Sci Fis Mat CNISM, Unita Padova, I-835131 Padua, Italy;‎ CNR, Ist Nazl Ott, Sezione Sesto Fiorentino, I-150019 Sesto Fiorentino, Italy

Abstract: We investigate ultracold and dilute bosonic atoms under strong transverse harmonic confinement using a 1D modified Gross-Pitaevskii equation (1D MGPE), which accounts for the energy dependence of the two-body scattering amplitude within an effective-range expansion. We study sound waves and solitons of the quasi-1D system, comparing the 1D MGPE results with the 1D GPE ones. We find that when the finite-size nature of the interaction is taken into account, the speed of sound and the density profiles of both dark and bright solitons show relevant quantitative changes with respect to predictions given by the standard 1D GPE.


Volume: 48 (11)      Pages from: 115301-1  to: 115301-7

KeyWords: ultracold gases; trapped gases; Boson systems; solitons
DOI: 10.1088/0953-4075/48/11/115301

Citations: 7
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