[institut] SCL seminar: Nonlinear excitations in BECs, Antun Balaz, petak 19. april u 14:00

[Nenad Vukmirovic]

Postovane koleginice i kolege,

Pozivam vas na SCL seminar koji ce u petak 19. aprila 2013. godine u 
14:00 u citaonici Instituta za fiziku odrzati Antun Balaz (SCL, Institut 
za fiziku u Beogradu). Naslov seminara i apstrakt su dati u nastavku ove 
poruke.

Nonlinear Excitations in Bose-Einstein Condensates: Parametric and 
Geometric Resonances

Abstract:

Bose-Einstein Condensates (BECs) are inherently nonlinear quantum 
systems, which leads to a number of interesting effects. Modulation of 
some of the parameters of a BEC can give rise to prominent nonlinear 
features, such as shifts in the frequencies of collective oscillation 
modes, higher harmonics generation, and resonant mode coupling. In a 
recent experiment, a Bose-Einstein condensate of Li-7 has been excited 
by a harmonic modulation of the atomic s-wave scattering length. 
Combining an analytical perturbative approach with extensive numerical 
simulations, we will analyze the emerging nonlinear dynamics of the 
system on the mean-field level at zero temperature. We will present 
resulting excitation spectra and main nonlinear effects close to 
parametric resonances. We will also discuss geometric resonances in BECs 
with two-body and three-body contact interactions, where even a geometry 
of the trapping potential leads to the emergence of nonlinear effects, 
frequency shifts and resonant mode coupling.

Srdacan pozdrav,

-- 
Dr Nenad Vukmirovic,
Visi naucni saradnik,
Laboratorija za primenu racunara u nauci,
Institut za fiziku Beograd,
Srbija.
URL: http://www.scl.rs/nenad