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arXiv · 2508.19384

Cavity Controls Core-to-Core Resonant Inelastic X-ray Scattering

S. -X. Wang·Z. -Q. Zhao·X. -Y. Wang·T. -J. Li·Y. Su·Y. Uemura·F. Alves Lima·A. Khadiev·B. -H. Wang·J. M. Ablett·J-P. Rueff·H. -C. Wang·O. J. L. Fox·W. -B. Li·L. -F. Zhu·X. -C. Huang
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Abstract

X-ray cavity quantum optics with inner-shell transitions has been hindered by the overlap between resonant and continuum states. Here, we report the first experimental demonstration of cavity-controlled co-to-core resonant inelastic x-ray scattering (RIXS). We eliminate the effects of the absorption edge by monitoring the RIXS profile, thereby resolving the resonant state from the overlapping continuum. We observe distinct cavity-induced energy shifts and cavity-enhanced decay rate in the $2p3d$ RIXS spectra of WSi$_{2}$. These effects, manifesting as stretched or shifted profiles in the RIXS planes, enable novel spectroscopic applications by cavity-controlled core-hole states. Our results establish core-to-core RIXS as a powerful tool for manipulating inner-shell dynamics in x-ray cavities, offering new avenues for integrating quanutm optical effects with x-ray spectroscopy.

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S. -X. Wang, Z. -Q. Zhao, X. -Y. Wang, T. -J. Li, Y. Su, Y. Uemura, F. Alves Lima, A. Khadiev, B. -H. Wang, J. M. Ablett, J-P. Rueff, H. -C. Wang, O. J. L. Fox, W. -B. Li, L. -F. Zhu, X. -C. Huang. 2025-08-26. Cavity Controls Core-to-Core Resonant Inelastic X-ray Scattering. https://doi.org/10.1103/z6xz-p7cm

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