Erlangen 2022 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 19: Ultra-cold atoms, ions and BEC I (joint session A/Q)
Q 19.3: Vortrag
Dienstag, 15. März 2022, 11:00–11:15, A-H2
Observation of Hole Pairing in Mixed-Dimensional Fermi-Hubbard Ladders — •Sarah Hirthe1,2, Thomas Chalopin1,2, Dominik Bourgund1,2, Petar Bojovic1,2, Annabelle Bohrdt3,4, Fabian Grusdt5,2, Eugene Demler3,6, Immanuel Bloch1,2,5, and Timon Hilker1,2 — 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.