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Evidence for Hubbard-type excitons in YVO3

By means of  broadband ultrafast pump-probe spectroscopy in the visible range we have been able to disentangle the thermal and nonthermal contributions to the optical transients across the Mott-Hubbard gap for YVO3. [http://prb.aps.org/pdf/PRB/v86/i16/e165135]





Revealing the nature of charge excitations in strongly correlated electron systems is crucial to understanding their exotic properties. Here we have used broadband ultrafast pump-probe spectroscopy in the visible range to study low-energy transitions across the Mott-Hubbard gap in the orbitally ordered insulator YVO3. Separating thermal and nonthermal contributions to the optical transients, we showed that the total spectral weight of the two lowest peaks is conserved, demonstrating that both excitations correspond to the same multiplet.

These observations, otherwise not conceivable using spectroscopies in the frequency domain, suggests that the optically pump-driven spin disorder can be used to quantify the kinetic energy gain of the excitons in the FM phase.

Last Updated on Monday, 26 November 2012 17:02