SCL Seminar by Javed Akram

SCL seminar of the Center for the Study of Complex Systems, will be held on Thursday, 24 August 2017 at 14:00 in the library reading room “Dr. Dragan Popović" of the Institute of Physics Belgrade. The talk entitled

"Tuning Static and Dynamic Properties of a Quasi-One-Dimensional Bose-Einstein Condensate"

will be given by Dr. Javed Akram (COMSATS Institute of Information Technology, Islamabad, Pakistan).

Abstract of the talk:

We will present a detailed theoretical study on tuning both static and dynamic properties of quasi-one-dimensional trapped Bose-Einstein condensates (BECs). At first, we will discuss Rb atoms in a quasi-one-dimensional trap geometry, which consists of a harmonic trap plus a red or blue-detuned Gaussian (Hermite-Gaussian) dimple trap [1]. After having switched off the dimple trap, shock waves or gray pair-soliton (bi-)trains emerge, which oscillates with a characteristic frequency in the remaining harmonic trap. Afterwards, we will investigate how the wave function of a trapped Rb BEC changes due to the presence of a single Cs impurity [2]. To this end, we will determine the equilibrium phase diagram, which is spanned by the intra- and inter-species coupling strengths. In addition, once the attractive or repulsive interspecies coupling strength is switched off, we will see that white shock waves or bi-solitons emerge. This is a phenomenon similar to a BEC in an optical dipole trap, although this time we will not see bi-soliton trains but only bi-solitons. Afterwards, we will analyze a quasi-one-dimensional BEC in a nonlinear gravito-optical surface trap [3]. We will calculate a non-ballistic expansion of the BEC cloud, when the confining evanescent laser beam is shut off, and check if the results agree with previously obtained experimental results of the Innsbruck experiment [4].

[1] J. Akram and A. Pelster, Phys. Rev. A 93, 023606 (2016); Laser Phys. 26, 065501 (2016).
[2] J. Akram and A. Pelster, Phys. Rev. A 93, 033610 (2016).
[3] J. Akram, et al., J. Phys. B: At. Mol. Opt. Phys. 49, 075302 (2016).
[4] D. Rychtarik et al., Phys. Rev. Lett. 92, 173003 (2004).

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