Erlangen 2018 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 41: Poster Session IIIa

A 41.5: Poster

Donnerstag, 8. März 2018, 16:15–18:15, Orangerie

Simulations for anisotropic superfluidity in a Dysprosium BEC — •Michael Eisenmann, Matthias Wenzel, Fabian Bötttcher, Jan-Niklas Schmidt, Tim Langen, Igor Ferrier-Barbut, and Tilman Pfau — 5. Physikalisches Institut and Center for Integrated Quantum Science and Technology, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany

One of the most remarkable effects in quantum mechanics, compared to classical systems, is the possibility of superfluid states, for example in ultra cold atom gases, characterized by the existence of frictionless irrotational flow.
This frictionless behaviour only appears below a certain, so called "critical", flow velocity. Another hallmark of superfluidity is the irrotationality of the flow, leading to the creation of vortices in a rotating superfluid.
Already known for decades in liquid helium, superfluid phenomena, like the critical velocity for vortex creation, have been observed in ultra-dilute superfluids of quantum degenerated gases.
In dipolar interacting systems the superfluidity acquires an anisotropic character, resulting in the systems critical velocity depending highly on the flow direction [1].
We are reporting on numerical simulations, allowing us to investigate the effects of anisotropic interactions on the critical flow velocity, as well as the density profile and the lattice structure of vortices in a Dysprosium Bose-Einstein condensate.
Ticknor, et. al., Physical review letters 106, 065301 (2011)