Dynamical renormalization of the magnetic excitation spectrum via high-momentum nonlinear magnonics
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arXiv
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| Hauptverfasser: | , , , , , , , , , , , |
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| Format: | Preprint |
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2023
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| author | Schoenfeld, Christoph Feuerer, Lennart Bär, Julian Dörfelt, Lukas Kerstingskötter, Maik Dannegger, Tobias Wuhrer, Dennis Belzig, Wolfgang Nowak, Uli Leitenstorfer, Alfred Juraschek, Dominik Bossini, Davide |
| author_facet | Schoenfeld, Christoph Feuerer, Lennart Bär, Julian Dörfelt, Lukas Kerstingskötter, Maik Dannegger, Tobias Wuhrer, Dennis Belzig, Wolfgang Nowak, Uli Leitenstorfer, Alfred Juraschek, Dominik Bossini, Davide |
| 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2310_19667 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Dynamical renormalization of the magnetic excitation spectrum via high-momentum nonlinear magnonics Schoenfeld, Christoph Feuerer, Lennart Bär, Julian Dörfelt, Lukas Kerstingskötter, Maik Dannegger, Tobias Wuhrer, Dennis Belzig, Wolfgang Nowak, Uli Leitenstorfer, Alfred Juraschek, Dominik Bossini, Davide Strongly Correlated Electrons 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. |
| title | Dynamical renormalization of the magnetic excitation spectrum via high-momentum nonlinear magnonics |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2310.19667 |