Regensburg 2025 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 31: Focus Session: Nonequilibrium Collective Behavior in Open Classical and Quantum Systems
DY 31.2: Talk
Thursday, March 20, 2025, 09:45–10:00, H37
Giant Dynamical Paramagnetism in the driven pseudogap phase of YBa2Cu3O6+x — •Marios Michael1, Duilio De Santis2, Eugene Demler3, and Patrick Lee4 — 1Max Planck Institute for the Structure and Dynamics of Matter, Luruper Chausse 149, 22761 Hamburg, Germany — 2Physics and Chemistry Dept., Interdisciplinary Theoretical Physics Group, Palermo University, 90128 Palermo, Italy — 3Institute for Theoretical Physics, ETH Zurich, 8093 Zurich, Switzerland — 4Department of Physics, MIT, 77 Massachusetts Avenue, 02139 Cambridge, MA, USA
In this talk, I will discuss theory aimed at understanding recent experimental data on driven YBa2Cu3O6+x published recently in Nature: Fava, S., De Vecchi, G., Jotzu, G. et al. Magnetic field expulsion in optically driven YBa2Cu3O6+x Nature 632,75-80 (2024). Experiments on optically pumped YBa2Cu3O6+x in the pseudogap phase far above Tc have shown evidence of dynamical Meissner effect. In our effort to understand the new experimental signatures, we have uncovered a universal instability triggered in Josephson junctions under a magnetic field that are strongly driven with an AC field. The instability leads to the generation of giant paramagnetic currents at the edges of Josephson junctions. For strong enough drive such instabilities ultimately lead to a soliton ratchet after driving. I will focus on why this instability of a generic Josephson junction is applicable to the pseudogap YBa2Cu3O6+x far above Tc and how it matches the experimental observations.
Keywords: Photo-induced superconductivity; Soliton dynamics; Ultra-fast magnetism; Pseudogap phase; High Tc cuprates