Speaker
Ms
Mihaela Carina Raportaru
(Horia Hulubei National Institute for Physics and Nuclear Engineering)
Description
Extended parametric resonances are one of the recurrent themes in the dynamics of quantum gases. Following some inceptive theoretical works Faraday waves have been observed in parametrically driven 87Rb BECs and 4He cells subject to vertical vibrations. These experimental observations have catalyzed the research activities and many theoretical investigations followed shortly. Among them we mention the emergence of density waves in dipolar and binary condensates, the transition to miscibility observed in non-miscible condensates and the suppression of Faraday waves in condensates loaded into optical lattices.
In this work we present the variational method introduced in Ref. [1] to describe the dynamics of cigar-shaped Bose-Einstein condensates of high density subject to periodic modulations of the radial component of the confining potential. The key ingredient of the variational treatment is the q-Gaussian radial envelope which describes the Thomas-Fermi regime of the condensate. A longitudinal density wave is grafted to the ansatz to account for Faraday and resonant waves. Using the variational equations, we investigate the dynamics of a realistic condensate for frequencies close to the radial frequency of the trap and show the emergence of the Faraday waves excited outside of resonance and that of the resonant wave that appears straight on resonance.
[1] M. C. Raportaru, Romanian Reports in Physics 64, 105, 2012.
Primary author
Ms
Mihaela Carina Raportaru
(Horia Hulubei National Institute for Physics and Nuclear Engineering)
