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Q: Fachverband Quantenoptik und Photonik

Q 22: Posters: Quantum Optics and Photonics II

Q 22.60: Poster

Dienstag, 10. März 2020, 16:30–18:30, Empore Lichthof

Local spin manipulation inside an atomic quantun point contact — •Philipp Fabritius, Martin Lebrat, Samuel Häusler, Jeff Mohan, Laura Corman, and Tilman Esslinger — Department of Physics, ETH Zurich, 8093 Zurich, Switzerland

We report on the control of spin inside a QPC using a local effective magnetic field. The versatility of cold-atom techniques allows us to precisely define a QPC using light potentials, to directly measure particle and spin currents and to tune interatomic interactions. In a first experiment performed with weakly interacting atoms, we locally lift the spin degeneracy of atoms inside the QPC using an optical tweezer tuned very close to atomic resonance which introduces a tunable effective Zeeman shift. We observe quantized, spin-polarized transport that is robust to dissipation and sensitive to interaction effects on the scale of the Fermi length. Using resonant light we measured the local loss around the quantum point contact which allowed us to reconstruct a two-dimensional density map similar to a scanning microscope. In a second experiment we investigate a unitary Fermi gas and the change of its transport properties when interacting with an effective Zeeman shift and spin-selective dissipation.