Berlin 2014 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 32: Poster: Quantum gases, ultracold atoms and molecules

Q 32.5: Poster

Mittwoch, 19. März 2014, 16:30–18:30, Spree-Palais

Crossover from Adiabatic to Sudden Quench Dynamics for Time-of-Flight Imaging Measurements in Bose-Einstein CondensatesBo Xiong1, Axel Pelster2, and •Antun Balaž11Scientific Computing Laboratory, Institute of Physics Belgrade, University of Belgrade, Serbia — 2Physics Department and Research Center OPTIMAS, Technische Universität Kaiserslautern, Germany

Time-of-flight imagining is one of the standard techniques used in experiments with Bose-Einstein condensates (BECs) to measure and study their physical properties. Here we investigate effects of a controlled time-dependent quench of a trapping potential on Time-of-Flight (TOF) images in one-component (87Rb) and two-component (a mixture of 87Rb and 39K) condensates. To this end we model the following experimental protocol: initially the condensate is in the ground state and then the frequencies of a cylindrically-symmetric harmonic trapping potential are quenched during a given time interval T. This will generate a BEC dynamics within the intriguing crossover from adiabatic to sudden quench dynamics, which affects the TOF images made immediately afterwards. We study both numerically and variationally such effects of quenching of a trapping potential, as well as necessary modifications to the algorithm used for reconstructing the density profile of a BEC cloud. The obtained results are relevant for new experiments, which are performed e.g. at the Center of Applied Space Technology and Microgravity (ZARM) at the University of Bremen [1] and offer a glimpse into the non-equilibrium BEC physics.

[1] T. van Zoest et al., Science 328, 1540 (2010).

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