Mainz 2026 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 42: Poster – Ultracold Matter (joint session Q/A)
Q 42.6: Poster
Wednesday, March 4, 2026, 17:00–19:00, Philo 2. OG
Dynamics of trapped dipolar Bose gases at BEC-quantum droplet crossover — •Denis Mujo1, Ivana Vasić1, Milan Radonić2,1, and Axel Pelster3 — 1Institute of Physics Belgrade, University of Belgrade, Serbia — 2I. Institute of Theoretical Physics, University of Hamburg, Germany — 3Physics Department, Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau, Germany
Since the first realization of quantum droplets [1], various experiments
have indicated that quantum droplets in a dipolar Bose system are
stabilized due to quantum fluctuations [2,3], correcting the
ground-state
energy. Here we study the dynamics of trapped dipolar Bose gases using
both time-dependent variational methods and full three-dimensional
simulations of the extended Gross-Pitaevskii equation. Our focus is on
the
crossover region between a BEC and a quantum droplet, where the system
becomes highly sensitive to parameter variations such as changes of the
s-wave scattering length or the strength of the trapping confinement. We
identify the critical conditions required to maintain droplet stability
when these parameters are varied, including the effects of different
variation rates and a complete removal of the trapping potential. And we
examine the behavior of collective excitation modes in the vicinity of
the
BEC-quantum droplet crossover.
[1] H. Kadau et al., Nature 530, 194 (2016).
[2] A.R.P. Lima and A. Pelster, Phys. Rev. A 84, 041604(R) (2011).
[3] F. Wächtler and L. Santos, Phys. Rev. A 93, 061603 (2016).
Keywords: Dipolar quantum droplets; Dipolar Bose gases; Dynamics; BEC-droplet crossover