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Bibliographic Details
Main Authors: Schoenfeld, Christoph, Feuerer, Lennart, Bär, Julian, Dörfelt, Lukas, Kerstingskötter, Maik, Dannegger, Tobias, Wuhrer, Dennis, Belzig, Wolfgang, Nowak, Uli, Leitenstorfer, Alfred, Juraschek, Dominik, Bossini, Davide
Format: Preprint
Published: 2023
Subjects:
Online Access:https://arxiv.org/abs/2310.19667
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Table of Contents:
  • Controlling macroscopic properties of quantum materials requires the ability to induce and manipulate excited states. The set of collective excitations of a solid is encoded in its dispersion relations. We find that the spectra of the low-momentum eigenmodes are renormalized by resonantly driving the high-momentum excitations. Our experimental data rule out laser-induced thermal processes as an origin of the renormalization. The photoinduced changes of the amplitudes and frequencies can be explained theoretically and numerically with a resonant light-scattering mechanism that couples high- and low-momentum eigenmodes in the dispersion relation across momentum space. While we demonstrate the renormalization of the magnetic spectrum in a quantum material, our experimental approach can be further generalized to lattice modes in semiconductors.