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arXiv · 1711.07275

Onset of a modulational instability in trapped dipolar Bose-Einstein condensates

Igor Ferrier-Barbut·Matthias Wenzel·Matthias Schmitt·Fabian Böttcher·Tilman Pfau
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Abstract

We explore the phase diagram of a finite-sized dysprosium dipolar Bose-Einstein condensate in a cylindrical harmonic trap. We monitor the final state after the scattering length is lowered from the repulsive BEC regime to the quantum droplet regime. Either an adiabatic transformation between a BEC and a quantum droplet is obtained or, above a critical trap aspect ratio $λ_{\rm c}=1.87(14)$, a modulational instability results in the formation of multiple droplets. This is in full agreement with the predicted structure of the phase diagram with a crossover region below $λ_{\rm c}$ and a multistable region above. Our results provide the missing piece connecting the previously explored regimes resulting in a single or multiple dipolar quantum droplets.

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Igor Ferrier-Barbut, Matthias Wenzel, Matthias Schmitt, Fabian Böttcher, Tilman Pfau. 2018-01-23. Onset of a modulational instability in trapped dipolar Bose-Einstein condensates. https://doi.org/10.1103/physreva.97.011604

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