Orateur
Prof.
Sadhan Adhikari
(São Paulo State University, Institute of Theoretical Physics)
Description
We study the formation and dynamics of bright, vortex-bright, and
gap solitons in a dipolar Bose-Einstein condensate (BEC). The
bright and vortex-bright solitons are considered in a cigar-shaped
dipolar BEC for large repulsive atomic interactions, while no
solitons can appear in a BEC of atoms without dipolar moment.
Phase diagram showing the region of stability of these solitons is
obtained. We also study the dynamics of breathing oscillation of
these solitons as well as the collision dynamics of two solitons at
large velocities. Two solitons placed side-by-side at rest coalesce
to form a stable bound soliton molecule due to dipolar attraction.
The gap solitons can appear and are considered in both disk- and
cigar-shaped dipolar BEC with weak atomic attraction and
repulsion. The gap solitons are localized, in the lowest band gap,
by three orthogonal optical lattice (OL) potentials. The onedimensional version of these solitons of experimental interest
confined by an OL along the dipole moment direction and
harmonic traps in transverse directions are also considered.
Dynamics of (i) breathing oscillation of a gap soliton and (ii)
dragging of a gap soliton by a moving lattice along axial direction
demonstrates the stability of the solitons.
We use both time-dependent variational analysis and numerical
solution of the mean-field Gross-Pitaevskii equation in this study
Author
Prof.
Sadhan Adhikari
(São Paulo State University, Institute of Theoretical Physics)
Co-auteurs
M.
Luis Ever Young-S
(Sao Paulo State University)
Dr
Paulsamy Muruganandam
(Sao Paulo State University)
