Magnetically mediated hole pairing in fermionic ladders of ultracold atoms

ORAL

Abstract

Doped antiferromagnets are prime examples of strongly correlated systems and hold the potential to shed light on the emergence of high-TC superconductivity in cuprate materials via pairing of mobile dopants. Here we report on the microscopic observation of hole pairing due to the magnetic correlations in a Fermi-Hubbard system by using quantum gas microscopy. We prepare two-leg ladders where we disable tunnelling between the rungs in order to suppress Pauli repulsion and thus drastically increase binding energy of the holes. Observing pairs of holes predominantly occupying the same rung of the ladder allows us to extract a binding energy slightly below the superexchange energy. For higher doping levels we find indications of crystallization of hole pairs.

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Presenters

  • Dominik Bourgund

    • Max Planck Institute for Quantum Optics
    • Max Planck Institute of Quantum Optics

Authors

  • Dominik Bourgund

    • Max Planck Institute for Quantum Optics
    • Max Planck Institute of Quantum Optics

  • Sarah Hirthe

    • Max Planck Institute of Quantum Optics

  • Thomas Chalopin

    • Max Planck Institute of Quantum Optics

  • Petar Bojovic

    • Max Planck Institute of Quantum Optics

  • Annabelle Bohrdt

    • Harvard University and ITAMP
    • ITAMP

  • Fabian Grusdt

    • LMU Munich
    • Ludwig-Maximilians-Universität (LMU-Munich)
    • Ludwig-Maximilians-Universitaet (LMU-Mun

  • Eugene Demler

    • ETH Zurich

  • Immanuel Bloch

    • Max Planck Institute for Quantum Optics
    • Ludwig-Maximilians-Universität (LMU-Munich), Max-Planck Institut für Quantenoptik (MPQ), Munich Center for Quantum Science and Technology (MCQST)
    • Max Planck Institute of Quantum Optics
    • Max Planck Institute of Quantum Optics, 85748 Garching, Germany and Fakultät für Physik, Ludwig-Maximilians-Universität, 80799 Munich, Germany

  • Timon Hilker

    • Max Planck Institute of Quantum Optics