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arXiv · 2210.06960

Propagating charge carrier plasmon in Sr2RuO4

Martin Knupfer·Fabian Jerzembeck·Naoki Kikugawa·Friedrich Roth·Joerg Fink
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Abstract

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 RPA 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 inter-band transition and not by quantum critical fluctuations. The results from these studies on a prototypical bad metal system show that the long-wavelength plasmon excitations near 1 eV are caused by resilient quasiparticles and are not influenced by correlation effects.

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Martin Knupfer, Fabian Jerzembeck, Naoki Kikugawa, Friedrich Roth, Joerg Fink. 2022-10-13. Propagating charge carrier plasmon in Sr2RuO4. https://doi.org/10.1103/physrevb.106.l241103

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