Présidents de session
Cold Atoms, Few- and Many-Body Physics
- Pierre Descouvemont (Universite Libre de Bruxelles)
Prof.
Arnaldo Gammal
(Universidade de Sao Paulo)
15/10/2014 09:00
We investigate by numerical simulations the pattern formation after an oscillating attractive-repulsive obstacle inserted into the flow of a Bose-Einstein condensate. For slow oscillations we observe a complex emission of vortex dipoles. For moderate oscillations organized lined up vortex dipoles are emitted. For high frequencies no dipoles are observed but only lined up dark fragments. The...
Sadhan Adhikari
(São Paulo State University, Institute of Theoretical Physics)
15/10/2014 09:40
Trapped degenerate dipolar Bose and Fermi gases of cylindrical symmetry
with the polarization vector along the symmetry axis are only stable for the strength
of dipolar interaction below a critical value. In the case of bosons, the stability of
such a dipolar Bose-Einstein condensate (BEC) is investigated for different strengths
of contact and dipolar interactions using variational...
Dr
jiang min zhang
(max-plank-institute-PKS)
15/10/2014 11:00
We study the one dimensional two-particle Bose-Hubbard model with a defect site. The continuum case of the model was claimed by McGuire to be nonintegrable fifty years ago, but now it is shown that the odd parity sector is integrable. More precisely, the odd-parity eigenstates are all in the Bethe-form.
Interestingly, this model offers a long-sought kind of exotic bound state: Bound state...
Dr
Mônica Andrioli Caracanhas
(Universidade de São Paulo)
15/10/2014 11:40
Turbulence is characterized by chaotic spinning flow regimes which appear in many important processes in nature. Vorticity, in superfluid systems, may present the simplest form of turbulence, and be a gateway to the study of this phenomenon in quantum gases. A 87Rb Bose condensate is used to observe and investigate quantum turbulence, by means of a weak, off-axis, magnetic field gradient,...
Dr
Marios Tsatsos
(Instiitute of Physics Sao Carlos, University of Sao Paulo)
15/10/2014 12:20
Superfluids are distinguished from ordinary fluids by the quantized manner the rotation is manifested in them. Precisely, quantized vortices are known to appear in the bulk of a superfluid subject to external rotation, beyond a critical velocity. In most of the studies so far the quantum fluids are considered to be coherent and condensed at all times. In this work I present two examples of...
