Hannover 2020 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 49: Quantum gases (Miscellaneous)

Q 49.3: Talk

Thursday, March 12, 2020, 14:45–15:00, e214

Dynamics of a 3D Bose gas in an optical lattice driven by local particle loss — •Christopher Mink, Axel Pelster, and Michael Fleischhauer — Physics Department and Research Center OPTIMAS, Technische Universität Kaiserslautern, Germany

We study both the steady states and the dynamics of a weakly interacting Bose gas, which is confined by an optical lattice in one spatial dimension as well as an isotropic harmonic trap in the two transveral directions and with local particle loss. To this end we start from first principles and use coherent-state phase space methods in order to derive a Fokker-Planck description of the emerging Bose-Einstein condensates. Neglecting quantum fluctuations we determine the condensate wave functions at each lattice site approximately by using a suitable variational ansatz. We discuss the strengths of this approach and demonstrate the limits of its applicability. Finally, we take quantum fluctuations into account by reducing the dimension of the Fokker-Planck equation and study their impact on the time evolution of the system numerically. With this we aim at reproducing the experimental results of Ref. [1] concerning the refilling dynamics of an empty site without any free parameters.

[1] R. Labouvie, B. Santra, S. Heun, and H. Ott, Phys. Rev. Lett. 116, 235302 (2016)