Hannover 2016 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 27: Poster: Quantum Optics and Photonics II

Q 27.10: Poster

Dienstag, 1. März 2016, 16:30–19:00, Empore Lichthof

Direct Observation of Chiral Superfluid Order — •Carl Hippler, Thorge Kock, Hannes Winter, and Andreas Hemmerich — Universität Hamburg

The overall goal of our experiment is to explore ultracold bosonic quantum gases in excited bands of an optical lattice. We investigate Rb-87 atoms in a bipartite interferometric lattice allowing us to change the lattice geometry dynamically. We observe the formation of a chiral superfluid order, arising from the interplay between the contact interaction of the atoms on each lattice site and the degeneracy of the p orbitals in the second Bloch band. A periodic pattern of locally alternating orbital currents and circular currents establishes in the lattice, time-reversal symmetry being spontaneously broken. We report on a technique that lets us directly observe the phase properties of the superfluid order parameter. Here, two independent atomic samples are produced in the second band at well separated spatial regions of the lattice and subsequently brought to interference.