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

Novelli F, Fausti D, Reul J, Cilento F, Van Loosdrecht PHM, Nugroho AA, Palstra TTM, Grueninger M, Parmigiani F (2012)

Publication Type: Journal article

Publication year: 2012

Journal

Physical Review B - Condensed Matter and Materials Physics American Physical Society (APS)

Book Volume: 86

Article Number: 165135

Journal Issue: 16

DOI: 10.1103/PhysRevB.86.165135

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. © 2012 American Physical Society.

Authors with CRIS profile

Daniele Fausti

Involved external institutions

Università degli Studi di Trieste IT Italy (IT) Universität zu Köln DE Germany (DE) Elettra Sincrotrone Trieste S.C.p.A. IT Italy (IT) University of Groningen / Rijksuniversiteit Groningen NL Netherlands (NL)

How to cite

APA:

Novelli, F., Fausti, D., Reul, J., Cilento, F., Van Loosdrecht, P.H.M., Nugroho, A.A.,... Parmigiani, F. (2012). Ultrafast optical spectroscopy of the lowest energy excitations in the Mott insulator compound YVO 3: Evidence for Hubbard-type excitons. Physical Review B - Condensed Matter and Materials Physics, 86(16). https://doi.org/10.1103/PhysRevB.86.165135

MLA:

Novelli, Fabio, et al. "Ultrafast optical spectroscopy of the lowest energy excitations in the Mott insulator compound YVO 3: Evidence for Hubbard-type excitons." Physical Review B - Condensed Matter and Materials Physics 86.16 (2012).

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