Bose-Einstein condensate in an elliptical waveguide

Year: 2022

Authors: Salasnich., L.

Autors Affiliation: Univ Padua, Dipartimento Fis & Astron G Galilei, Via F Marzolo 8, I-35131 Padua, Italy; Univ Padua, QTech, Via F Marzolo 8, I-35131 Padua, Italy; Ist Nazl Fis Nucl, Sez Padova, Via Marzolo 8, I-35131 Padua, Italy; Ist Nazl Ottica, Consiglio Nazl Ric, Unità Sesto Fiorentino, Via Nello Carrara 2, I-50019 Sesto Fiorentino, Italy.

Abstract: We investigate the effects of spatial curvature for an atomic Bose-Einstein condensate confined in an elliptical waveguide. The system is well described by an effective 1D Gross-Pitaevskii equation with a quantum-curvature potential, which has the shape of a double-well but crucially depends on the eccentricity of the ellipse. The ground state of the system displays a quantum phase transition from a two-peak configuration to a one-peak configuration at a critical attractive interaction strength. In correspondence of this phase transition the superfluid fraction strongly reduces and goes to zero for a sufficiently attractive Bose-Bose interaction.

Journal/Review: SCIPOST PHYSICS CORE

Volume: 5 (1)      Pages from: 15-1  to: 15-11

KeyWords: Bound-states; Quantum
DOI: 10.21468/SciPostPhysCore.5.1.015

Citations: 6
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