Abstract
In recent years, inelastic Raman scattering has been proven to be a valuable tool for probing collective excitations in strongly correlated electron systems because its polarization dependence allows to probe different regions of the Brollouin zone, see Devereaux and Hackl (2007) for a review. Inelastic Raman scattering is a photon-in photon-out process. Light couples to electronic charges in solids and the transferred energy can excite different types of excitations. For example, optical phonons lead to sharp lines at well-known positions and orientations of the incoming and outgoing photon polarizations, whereas at higher energies a much broader signal can be attributed to two-magnon scattering occurring in materials with antiferromagnetic correlations (Devereaux and Hackl 2007). In Mott insulators, the Raman excitation process couples the induced electron–hole pair exactly to the two-magnon states which are relevant for magnetism (Shastry and Shraiman 1990). Thereby, Raman scattering has been successfully used for understanding the dynamics and interactions of magnons in various antiferromagnetically ordered 3d transition metal oxides, especially in the high-Tc superconductor parent compounds (Chubukov and Frenkel 1995a,b; Blumberg et al. 1996, 1997).
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Knolle, J. (2016). Raman Scattering. In: Dynamics of a Quantum Spin Liquid. Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-319-23953-8_6
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