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Journal Article

Propagating charge carrier plasmons in Sr2RuO4


Jerzembeck,  Fabian
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Knupfer, M., Jerzembeck, F., Kikugawa, N., Roth, F., & Fink, J. (2022). Propagating charge carrier plasmons in Sr2RuO4. Physical Review B, 106(24): L241103, pp. 1-6. doi:10.1103/PhysRevB.106.L241103.

Cite as: https://hdl.handle.net/21.11116/0000-000C-7329-5
We report on studies of charge carrier plasmon excitations in Sr2RuO4 by transmission electron energy-loss spectroscopy. In particular, we present results on the plasmon dispersion and its width as a function of momentum transfer. The dispersion can be qualitatively explained in the framework of random phase approximation calculations, using an unrenormalized tight-binding band structure. The constant long-wavelength width of the plasmon indicates that it is caused by a decay into interband transitions and not by quantum critical fluctuations. The results from these studies on a prototypical correlated metal system show that the long-wavelength plasmon excitations near 1 eV are caused by resilient quasiparticles and are not influenced by correlation effects. © 2022 American Physical Society.