Dresden 2026 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 30: Nonequilibrium Quantum Systems I (joint session TT/DY)
DY 30.9: Talk
Wednesday, March 11, 2026, 11:45–12:00, CHE/0091
A comparative study of perturbative and nonequilibrium Green's function approaches for Floquet sidebands in periodically driven quantum systems — •Karun Gadge1, Marco Merboldt2, Wiebke Bennecke2, Jan Philipp Bange2, Marcel Reutzel3, Stefan Mathias2, Michael A Sentef4, Michael Schüler5, and Salvatore R Manmana1 — 1Institute for Theoretical Physics, Georg-August-University Göttingen, Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany — 2I. Physikalisches Institut, Georg-August-University Göttingen, Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany — 3Fachbereich Physik, Philipps-University Marburg, Marburg, Germany — 4Institute for Theoretical Physics and Bremen Center for Computational Materials Science, University of Bremen, 28359 Bremen, Germany — 5Laboratory for Materials Simulations, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
We compare two complementary theoretical approaches to compute and interpret Floquet sidebands in periodically driven quantum materials: a first-order perturbative approach (PB1) and time-dependent nonequilibrium Green's functions (tdNEGF). Using graphene as a model Dirac system, we disentangle in pump-probe setups Floquet-dressed initial states, Volkov-dressed final states (also known as laser-assisted photoelectric effect, LAPE), and their interference. We quantify how photoemission matrix elements, polarization, incidence angle, and near-surface screening shape the momentum-resolved sideband intensity observed in tr-ARPES.
Keywords: Floquet-Bloch Bands; Graphene; Time dependent nonequilibrium Greens functions; First-order perturbation; Photoemission spectroscopy and trARPES