Mainz 2017 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 38: Quantum Gases: Bosons V
Q 38.4: Vortrag
Mittwoch, 8. März 2017, 15:15–15:30, P 204
Droplet Formation in Quantum Ferrofluids in Ring Trap Geometry — •Antun Balaž1 and Axel Pelster2 — 1Scientific Computing Laboratory, Center for the Study of Complex Systems, Institute of Physics Belgrade, University of Belgrade, Serbia — 2Physics Department and Research center OPTIMAS, Technical University of Kaiserslautern, Germany
In the recent experiment [1], the Rosensweig instability was observed in a quantum ferrofluid of a strongly dipolar BEC, leading to a formation of atomic droplets. In Ref. [2] it was demonstrated that the stability of such droplets is due to quantum fluctuation correction of the ground-state energy [3,4]. Here we extend this previous theoretical description and develop a full Bogoliubov-Popov theory, which also takes into account the condensate depletion due to quantum fluctuations. We apply this approach to study the droplet formation in a 164Dy BEC in ring trap geometry where, after a sudden reduction of the scattering length, the dipolar quantum gas creates a droplet ring. We use extensive numerical simulations in order to study various properties of the emerging droplets, such as their number, size, and distribution. We also study how a phase imprinting affects the droplet formation process.
[1] H. Kadau, et al., Nature 530, 194 (2016).
[2] L. Chomaz, et al., Phys. Rev. X 6, 041039 (2016).
[3] T. D. Lee, K. Huang, and C.N. Yang, Phys. Rev. 106, 1135 (1957).
[4] A.R.P. Lima and A. Pelster, Phys. Rev. A 84, 041604(R) (2011); Phys. Rev. A 86, 063609 (2012).