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A: Fachverband Atomphysik

A 7: Ultra-cold atoms, ions and BEC I (joint session A/Q)

A 7.3: Vortrag

Dienstag, 15. März 2022, 11:00–11:15, A-H2

Observation of Hole Pairing in Mixed-Dimensional Fermi-Hubbard Ladders — •Sarah Hirthe^1,2, Thomas Chalopin^1,2, Dominik Bourgund^1,2, Petar Bojovic^1,2, Annabelle Bohrdt^3,4, Fabian Grusdt^5,2, Eugene Demler^3,6, Immanuel Bloch^1,2,5, and Timon Hilker^1,2 — ¹Max-Planck-Institut für Quantenoptik, Garching, Germany — ²Munich Center for Quantum Science and Technology, Munich, Germany — ³Harvard University,Cambridge, USA — ⁴ITAMP, Harvard-Smithsonian Center for Astrophysics, Cambridge, USA — ⁵Ludwig-Maximilians-Universität, Munich, Germany — ⁶ETH Zurich, Zurich, Switzerland

Doping an antiferromagnet lies at the heart of many strongly correlated systems and the pairing of dopants in particular is believed to play a key role in the emergence of high-Tc superconductivity. In the talk I will discuss our recent direct 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 the tunneling along the rungs is suppressed, while enhanced spin exchange supports singlet formation, thus drastically increasing the binding energy. We observe pairs of holes preferably occupying the same rung of the ladder. We furthermore find indications for repulsion between pairs when there is more than one pair in the system.