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Resonant Inelastic X-ray Scattering (RIXS) provides direct access to elementary charge, spin and orbital excitations in complex oxides. As a technique it has made tremendous progress with the advent high-brilliance synchrotron X-ray sources. From the theoretical perspective the fundamental question is to which precisely which low-energy correlation functions RIXS is sensitive. I will show that depending on the experimental RIXS setup, the measured charge dynamics can include charge-transfer, phonon, d-d and orbital excitations [1,2]. RIXS also allows probing spin dynamics, in particular magnons and bi-magnons dispersions [3,4]. Based on these observations, I will discuss the novelties that RIXS reveals on the spin dynamics of High Tc cuprates [5].
[1] Ament et al. Rev. Mod Phys, in press; arXiv:1009.3630 [2] Forte et al., PRL 101, 106406 (2008). [3] Braicovich et al., PRL 102, 167401 (2009). [4] Ament et al., PRL 103, 117003 (2009). [5] Braicovich et al., PRL 104, 077002 (2010). |
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