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Q: Fachverband Quantenoptik und Photonik

Q 16: Bosonic Quantum Gases III (joint session Q/A)

Q 16.8: Vortrag

Dienstag, 12. März 2024, 12:45–13:00, Aula

Effects of quantum depletion and gradient corrections on the critical atom number of dipolar droplets — Milan Radonjić^1,2, Axel Pelster³, and •Antun Balaž² — ¹I. Institute of Theoretical Physics, University of Hamburg, Germany — ²Center for the Study of Complex Systems, Institute of Physics Belgrade, University of Belgrade, Serbia — ³Physics Department and Research Center OPTIMAS, Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau, Germany

The first experimental realization of quantum droplets in dipolar condensates [1] has highlighted the importance of quantum fluctuations [2], which were later shown to be the main source of system’s stability against the dipolar collapse. The droplets were predicted and shown to be self-bound beyond the critical atom number even without the trap. However, there is a systematic difference in theoretical estimates of the critical atom number and experimental results [3]. Here we use an approach based on the extended Gross-Pitaevskii equation, which includes quantum depletion and beyond-LDA gradient corrections, to numerically and variationally study their effects on the critical atom number.
[1] H. Kadau et al., Nature 530, 194 (2016).

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

[3] F. Böttcher et al., Phys. Rev. Research 1, 033088 (2019).