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Q: Fachverband Quantenoptik und Photonik
Q 26: Quantum Gases (Fermions)
Q 26.4: Talk
Wednesday, March 16, 2022, 11:15–11:30, Q-H10
Realising the Symmetry-Protected Haldane Phase in Fermi-Hubbard Ladders — •Dominik Bourgund1, Sarah Hirthe1, Pimonpan Sompet1,2, Thomas Chalopin1, Joannis Koepsell1, Petar Bojovic1, Guillaume Salomon3, Julian Bibo4, Ruben Verresen5, Frank Pollmann4, Christian Groß1,6, Immanuel Bloch1,7, and Timon A. Hilker1 — 1Max-Planck-Institut für Quantenoptik, Garching, Germany — 2Research Center for Quantum Technology, Chiang Mai, Thailand — 3Universität Hamburg, Germany — 4Technical University of Munich, Garching, Germany — 5Harvard University, Cambridge, MA, USA — 6Eberhard Karls Universität, Tübingen, Germany — 7Ludwig-Maximilians-Universität, München, Germany
The antiferromagnetic spin-1 Haldane chain with its symmetry-protected fourfold-degenerate edge states was instrumental in understanding the impact of topological properties on quantum phases of matter. Its bulk exhibits vanishing two-point correlations, gapped excitations, and a characteristic non-local order parameter. Here we report on the realisation of such a topological Haldane phase using ultracold atoms in Fermi-Hubbard ladders. Exploiting the capabilities of our quantum gas microscope, we perform single-site and spin-resolved measurements to calculate non-local correlation functions, revealing the topological order as well as localised spin-1/2 edge states. By tuning the interactions in the system, we explore the transition from the Heisenberg limit into the Hubbard regime and thus show the robustness of the phase with respect to charge fluctuations.