Regensburg 2025 – wissenschaftliches Programm

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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: Vortrag

Donnerstag, 20. März 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