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Erlangen 2022 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 57: Quantum Gases II

Q 57.5: Poster

Donnerstag, 17. März 2022, 16:30–18:30, P

Hole pairing in Fermi-Hubbard ladders systems observed with a quantum gas microscope — •Thomas Chalopin1, Sarah Hirthe1, Dominuk Bourgund1, Petar Bojović1, Annabelle Bohrdt3, Fabian Grusdt2, Eugene Demler4, Immanuel Bloch1,2, and Timon Hilker11Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany — 2Ludwig-Maximilians-Universität, 80799 München, Germany — 3Harvard University, Cambridge, MA 02138, USA — 4ETH Zurich, 8093 Zurich, Switzerland

The Fermi-Hubbard model is an iconic model of solid state physics that is believed to capture the intricate physics of strongly correlated phases of matter such as High-Tc superconductivity. Such a state of matter supposedly achieved upon doping a cold antiferromagnetic Mott insulator. Pairing of dopants (holes), in particular, is considered to be a key mechanism for the occurrence of unconventional superconductivity.

Here, I will present our experimental observation of hole pairing due to magnetic order in a Fermi-Hubbard-type system in our Lithium quantum-gas microscope. We engineer mixed-dimensional*Fermi-Hubbard ladders in which an offset suppresses the tunneling along the rungs, while it enhances spin exchange and singlet formation, thus drastically increasing the binding energy. We observe that holes preferably sit on the same rung in order to maintain magnetic ordering, i.e. singlets on the other rungs of the ladder. We furthermore find indications for repulsion between pairs when there is more than one pair in the system.

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