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Q: Fachverband Quantenoptik und Photonik
Q 57: Quantum Gases II
Q 57.9: Poster
Thursday, March 17, 2022, 16:30–18:30, P
Realization of the symmetry-protected Haldane phase in Fermi-Hubbard ladders — •Petar Bojović1, Pimonpan Sompet1,2, Sarah Hirthe1, Dominik Bourgund1, Thomas Chalopin1, Joannis Koepsell1, Guillaume Salomon1,3, Julian Bibo4, Ruben Verresen5, Frank Pollmann4, Christian Gross1,6, Immanuel Bloch1,7, and Timon Hilker1 — 1Max-Planck-Institut für Quantenoptik, Garching — 2Research Center for Quantum Technology, Chiang Mai University, Chiang Mai, — 3Institut für Laserphysik, Universität Hamburg, Hamburg — 4Department of Physics, Technical University of Munich, Garching — 5Department of Physics, Harvard University, Cambridge — 6Physikalisches Institut, Universität Tübingen, Tübingen — 7Fakultät für Physik, Ludwig-Maximilians-Universität, München
The Haldane antiferromagnetic spin-1 chain constitutes a paradigmatic model of a quantum system which holds a symmetry-protected topological phase. Here, we experimentally realize the Haldane phase using Fermi-Hubbard ladders in an ultracold quantum gas microscope. Site-resolved potential shaping allows us to create tailored spin-1/2 geometries which permit the exploration of such a topological chain and its comparison to a trivial configuration. We use spin- and density-resolved measurements to probe edge and bulk properties of the system, revealing a non-local string order parameter and localized spin-1/2 edge states We furthermore investigate the robustness of the topological phase upon the onset of density fluctuations by tuning the Hubbard interaction.