Ultrafast optical spectroscopy of the lowest energy excitations in the Mott insulator compound YVO 3: Evidence for Hubbard-type excitons

Fabio Novelli, Daniele Fausti*, Julia Reul, Federico Cilento, Paul H.M. Van Loosdrecht, Agung A. Nugroho, Thomas T.M. Palstra, Markus Grüninger, Fulvio Parmigiani

*Corresponding author for this work

    Research output: Contribution to journalArticleAcademicpeer-review

    24 Citations (Scopus)

    Abstract

    Revealing the nature of charge excitations in strongly correlated electron systems is crucial to understanding their exotic properties. Here we use broadband ultrafast pump-probe spectroscopy in the visible range to study low-energy transitions across the Mott-Hubbard gap in the orbitally ordered insulator YVO 3. Separating thermal and nonthermal contributions to the optical transients, we show that the total spectral weight of the two lowest peaks is conserved, demonstrating that both excitations correspond to the same multiplet. The pump-induced transfer of spectral weight between the two peaks reveals that the low-energy one is a Hubbard exciton, i.e., a resonance or a nearly bound state between a doublon and a holon. Finally, we speculate that the pump-driven spin disorder can be used to quantify the kinetic energy gain of the excitons in a ferromagnetic environment.

    Original languageEnglish
    Article number165135
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume86
    Issue number16
    DOIs
    Publication statusPublished - 31 Oct 2012

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