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Q: Fachverband Quantenoptik und Photonik

Q 25: Poster: Quantum Optics and Photonics I

Q 25.34: Poster

Tuesday, March 12, 2019, 16:30–18:30, S Atrium Informatik

Engineering and measuring density-dependent Peierls phases as a fundamental coupling mechanism of gauge and matter fields — •Kilian Sandholzer, Frederik Görg, Joaquín Minguzzi, Konrad Viebahn, Rémi Desbuquois, Michael Messer, and Tilman Esslinger — ETH Zürich, Switzerland

The implementation of artificial gauge fields for cold atoms in optical lattices established these systems as a powerful tool to study the effects of electromagnetic fields and spin-orbit coupling. So far, the gauge potentials were classical external fields without any back-action from the atoms and could, therefore, not reproduce a full lattice gauge theory. We present and implement a scheme that realizes the coupling mechanism via a non-trivial Peierls phase that depends on the site occupation of fermions in a Hubbard dimer. We use a two color driving scheme that explicitly breaks time-reversal symmetry and determine experimentally amplitude and phase of the tunneling process. In addition, we demonstrate the phase winding and gap closing induced by a Dirac point in the modulation parameter space.