Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 61: Ultrafast Dynamics of Light-Driven Systems (joint session TT/MA)

TT 61.4: Vortrag

Donnerstag, 19. März 2020, 15:45–16:00, HSZ 201

Creating non-equilibrium orders in high-temperature superconductors — •Guido Homann1, Jayson Cosme1,2, and Ludwig Mathey1,21Zentrum für Optische Quantentechnologien und Institut für Laserphysik, Universität Hamburg, 22761 Hamburg, Germany — 2The Hamburg Center for Ultrafast Imaging, 22761 Hamburg, Germany

We simulate far-out-of-equilibrium dynamics in cuprate superconductors, such as YBCO, employing a semiclassical approach. Our approach combines relativistic c-field theory with a U(1) lattice gauge theory, resulting in a 3D lattice of intrinsic Josephson junctions. Our description includes dissipation and thermal fluctuations. It constitutes an extension of 1D sine-Gordon models, due to the inclusion of amplitude dynamics and of in-plane fluctuations. We implement a variety of driving protocols, which address the plasmonic or phononic degrees of freedom, and explore the resulting non-equilibrium scenarios. As a central example, we apply our method to transient phenomena induced in pump-probe protocols, and compare to observed phenomena. This work extends and builds on previous studies reported in [1,2], and has its main focus on the creation of metastable superconducting states.

[1] J. Okamoto, A. Cavalleri, L. Mathey, Phys. Rev. Lett. 117, 227001 (2016).

[2] J. Okamoto, W. Hu, A. Cavalleri, L. Mathey, Phys. Rev. B 96, 144505 (2017).

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