Berlin 2014 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 32: Poster: Quantum gases, ultracold atoms and molecules
Q 32.45: Poster
Mittwoch, 19. März 2014, 16:30–18:30, Spree-Palais
Observation of the Meissner effect in bosonic ladders — •Marcos Atala1,2, Monika Aidelsburger1,2, Michael Lohse1,2, Julio Barreiro1,2, Belén Paredes3, and Immanuel Bloch1,2 — 1Fakultät für Physik, Ludwig-Maximilians-Universität, Schellingstrasse 4, 80799 München, Germany — 2Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, 85748 Garching, Germany — 3Instituto de Física Teórica CSIC/UAM C /Nicolás Cabrera, 13-15 Cantoblanco, 28049 Madrid, Spain
We implemented a large uniform effective magnetic field with ultracold atoms using laser-assisted tunneling in a ladder created with an optical lattice. Depending on the ratio between the coupling along the rungs of the ladder and the one along the legs of the ladder, the system presents two different phases: the vortex phase, where the probability currents along the bonds have a vortex structure, and the Meissner phase where the currents form a single vortex of infinite length. In order to detect the probability currents associated to the different phases we populated the ground state of the flux ladder and subsequently projected the state into isolated double well potentials that allowed us to measure the average current direction and strength. We observed the different behavior of the current in both regimes. Furthermore, we also measured the time-of-flight momentum distribution of the ground state for different lattice parameters.