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In strongly correlated electron system with degenerate orbitals, orbitons are predicted to exist. This collective degree of freedom has so far not been uncontroversially observed. The hallmark of collective excitations is dispersion. To observe the orbiton dispersion, the rapidly developing technique of Resonant Inelastic X-ray Scattering (RIXS) is especially well suited. We present a theory for how RIXS can probe orbitons in LaMnO3 and YTiO3. Two different mechanisms for exciting orbitons play a role. We compare our theory to recent experimental data on YTiO3, strikingly suggesting the presence of orbitons. |
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