Erlangen 2018 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 51: Poster: Quantum Optics and Photonics IV

Q 51.5: Poster

Mittwoch, 7. März 2018, 16:15–18:15, Redoutensaal

Bloch oscillations in the second band of an optical lattice — •Carl Hippler, José Vargas, Thorge Kock, and Andreas Hemmerich — Institut für Laserphysik, Universität Hamburg, Luruper Chaussee 149, 22761 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 2D 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 Bloch oscillations in the second band of the lattice, starting at the two inequivalent X points.