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Q: Fachverband Quantenoptik und Photonik
Q 42: Quantum gases: Disorder- or interaction-induced effects
Q 42.3: Vortrag
Donnerstag, 20. März 2014, 14:45–15:00, UDL HS2002
Faraday Waves in Collisionally Inhomogeneous Bose-Einstein Condensates — •Antun Balaž1, Remus Paun2, Alexandru Nicolin3, Sudharsan Balasubramanian3, and Radha Ramaswamy3 — 1Scientific Computing Laboratory, Institute of Physics Belgrade, University of Belgrade, Serbia — 2Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest, Romania — 3Government College for Women, Kumbakonam, India
We study the emergence of Faraday waves in quasi-one-dimensional collisionally inhomogeneous Bose-Einstein condensates subject to periodic modulation of the radial confinement. Considering a Gaussian-shaped radially inhomogeneous scattering length, we show through extensive numerical simulations and detailed variational treatment that the period of the emerging Faraday waves increases as the inhomogeneity of the scattering length gets weaker, and saturates once the width of the radial inhomogeneity reaches the radial width of the condensate. We also show that when the modulation frequency is close to the trap radial frequency, the condensate exhibits resonant waves accompanied by excitation of collective modes, while for frequencies close to twice that of the trap radial frequency, the observed Faraday waves set in forcefully and quickly destabilize condensates with weakly inhomogeneous two-body interactions, unlike in the case of homogeneous interactions [1].
[1] A. Balaž and A. I. Nicolin, Phys. Rev. A 85, 023613 (2012).