Hannover 2016 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 17: Quantum Gases: Bosons I

Q 17.2: Talk

Tuesday, March 1, 2016, 11:30–11:45, e001

Rosensweig instability due to three-body interaction or quantum fluctuations? — Vladimir Lončar¹, Dušan Vudragović¹, •Antun Balaž¹, and Axel Pelster² — ¹Scientific Computing Laboratory, 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 ¹⁶⁴Dy Bose-Einstein condensate, which represents a quantum ferrofluid due to the large atomic magnetic dipole moments. After a sudden reduction of the scattering length, which is realized by tuning the external magnetic field far away from a Feshbach resonance, the dipolar quantum gas creates self-ordered surface structures in form of droplet crystals. As the underlying Gross-Pitaevskii equation is not able to explain the emergence of that Rosensweig instability, we extend it by both three-body interactions [2-4] and quantum fluctuations [5]. We then use extensive numerical simulations in order to study the interplay of three-body interactions as well as quantum fluctuations on the emergence of the Rosensweig instability.

[1] H. Kadau, M. Schmitt, et al., arXiv:1508.05007v2 (2015).

[2] H. Al-Jibbouri, I. Vidanović, A. Balaž, and A. Pelster, J. Phys. B 46, 065303 (2013).

[3] R. N. Bisset and P. B. Blakie, arXiv:1510.09013 (2015).

[4] K.-T. Xi and H. Saito, arXiv:1510.07842 (2015).

[5] A. R. P. Lima and A. Pelster, Phys. Rev. A 84, 041604(R) (2011); Phys. Rev. A 86, 063609 (2012).