Berlin 2024 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 5: Nickelates I
TT 5.12: Talk
Monday, March 18, 2024, 12:30–12:45, H 3007
Feshbach resonances in cuprate and nickelate high-Tc superconductors — •Fabian Grusdt1,2, Annabelle Bohrdt2,3, Lukas Homeier1,2, Hannah Lange1,2,4, Henning Schloemer1,2, Ulrich Schollwoeck1,2, and Eugene Demler5 — 1Department of Physics and Arnold Sommerfeld Center for Theoretical Physics (ASC), Ludwig-Maximilians-Universität München, Theresienstr. 37, München D-80333, Germany — 2Munich Center for Quantum Science and Technology (MCQST), Schellingstr. 4, D-80799 München, Germany — 3University of Regensburg, Universitätsstr. 31, Regensburg D-93053, Germany — 4Max-Planck-Institute for Quantum Optics, Hans-Kopfermann-Str.1, Garching D-85748, Germany — 5Institute for Theoretical Physics, ETH Zurich, 8093 Zürich, Switzerland
Experimental advances in solids, quantum simulators, and numerical techniques allow unprecedented microscopic studies of the structure of strongly correlated quantum matter. Taking advantage of these achievements, we present evidence for the existence of a Feshbach resonance in Hubbard and t-J models commonly used to model cuprate and nickelate compounds. In a 2d square lattice, we show that attractive d-wave interactions between magnetic-polaron charge carriers are mediated through coupling to a near-resonant bosonic paired state of two holes. We present a closely related Feshbach picture for the bilayer nickelate superconductors under pressure, described by a mixed-dimensional t-J model. As an outlook we describe how higher critical temperatures can be reached, including in ultracold atom experiments that have previously observed strong pairing mixed dimensions.
Keywords: Feshbach-resonance; bilayer nickelate superconductors; BEC-BCS crossover; Pairing dome; mixed-dimensional t-J model