Jul 17 – 22, 2022
Royal Conservatory of Music, Toronto
America/Toronto timezone

Magnetically mediated hole pairing in fermionic ladders of ultracold atoms

Jul 19, 2022, 5:00 PM
1h 30m
Hart House (Hart House)

Hart House

Hart House

7 Hart House Cir, Toronto, ON M5S 3H3
Poster presentation Degenerate gases, many-body physics, and quantum simulation Poster session


Thomas Chalopin (Max-Planck-Institute for Quantum Optics)


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 is 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 correlations in a Fermi-Hubbard-type system in our Lithium quantum-gas microscope. We engineer mixed-dimensional Fermi-Hubbard two-leg ladders in which a potential offset between the legs suppresses the tunneling along the rungs, while enhancing spin exchange and singlet formation, thus drastically increasing the hole binding energy. We observe in particular that holes preferably sit on the same rung in order to maintain magnetic ordering, and we extract a binding energy on the order of the spin exchange energy. We furthermore find indications for repulsion between pairs when there are several hole pairs in the system.

Presenter name Thomas Chalopin

Primary authors

Thomas Chalopin (Max-Planck-Institute for Quantum Optics) Sarah Hirthe (Max-Planck-Institute for Quantum Optics) Dominik Bourgund (Max-Planck-Institute for Quantum Optics) Petar Bojović (Max-Planck-Institute for Quantum Optics) Annabelle Bohrdt (Harvard University) Eugene Demler (ETH Zurich) Fabian Grusdt (LMU Munich) Immanuel Bloch (Max-Planck-Institute for Quantum Optics) Timon Hilker (Max-Planck-Institute for Quantum Optics)

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