Affiliation:
1. Istituto Nazionale di Ottica del Consiglio Nazionale delle Ricerche
2. National Institute for Nuclear Physics Padova Division
3. University of Padua
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.
Cited by
6 articles.
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