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TT: Tiefe Temperaturen

TT 14: FV-internes Symposium ”Orbital Physics”

TT 14.10: Talk

Tuesday, March 9, 2004, 17:40–17:55, H18

Spin-orbital physics in Raman and optical spectra of Mott insulators — •Giniyat Khaliullin — a:Max-Planck-Institut FKF, Heisenbergstr.1, 70569 Stuttgart

We review our recent work which focuses on Raman [1] and optical [2] spectroscopy in Mott insulators. First, we discuss different Raman scattering channels involving orbital excitations in titanates. Next, we consider the spectral weights of optical transitions in titanates and cubic vanadates. We show that the temperature and polarization dependences of the Raman and optical spectra are directly determined by the underlying spin and orbital correlations, and discuss the role played by orbital quantum fluctuations.

[1] G. Khaliullin, (unpublished).

[2] G. Khaliullin, P. Horsch, and A.M. Oleś, (unpublished).