Mainz 2017 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 14: Quantum Gases: Bosons II

Q 14.1: Vortrag

Montag, 6. März 2017, 17:00–17:15, P 204

Bose-Einstein condensates and Conical Refraction: Novel Approach to Toroidal Guiding Potentials for ATOMTRONIC Devices — •Felix Schmaltz, Patrick van Beek, Philip Prediger, Felix Weigand, and Gerhard Birkl — Institut für Angewandte Physik, Technische Universität Darmstadt, Schlossgartenstraße 7, 64289 Darmstadt

We present a novel type of toroidal guiding potential for BEC-based coherent matter waves applicable for atom interferometry or ATOMTRONIC devices such as atomic SQUIDS.

Exploiting the effect of conical refraction in biaxial crystals, we are able to create various types of light field patterns, which can act as dipole force mediated toroidal matter waveguides. Depending on laser beam and crystal parameters, the topology and dimension of these waveguides can be controlled.

Only by changing the waist of the impinging laser beam, the conical refraction light field, using blue detuned light, can be transformed from a harmonical to a toroidal trapping potential. Using dynamically tunable lenses, we can realize the adiabatic transformation of a BEC from a simply connected to a multiply connected trapping topology.

Such a toroidal matter wave can be used to probe superfluidity and vortex-like behavior of confined BECs in a dynamically adjustable fashion.