Hubbard exciton revealed by time-domain optical spectroscopy

Abstract

We use broadband ultra-fast pump-probe spectroscopy in the visible range to study the lowest excitations across the Mott-Hubbard gap in the orbitally ordered insulator YVO3. Separating thermal and non-thermal 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 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 the ferromagnetic phase.

5 pages and 6 figures, 9 pages and 12 figures with additional materials

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Cited by in corpus (29)

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• Exciton-driven antiferromagnetic metal in a correlated van der Waals insulator
• Ultrafast charge recombination in photoexcited Mott-Hubbard insulator
• Mechanism of Ultrafast Relaxation of a Photo-Carrier in Antiferromagnetic Spin Background
• Witnessing the formation and relaxation of massive quasi-particles in a strongly correlated electron system
• Confinement-Deconfinement Transition as an Indication of Spin-Liquid-Type Behavior in Na${}_2$IrO${}_3$
• Optical response of highly excited particles in a strongly correlated system
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• Dynamics of doublon-holon pairs in Hubbard two-leg ladders
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• Peltier effect in strongly driven quantum wires
• Low-energy V t2g orbital excitations in NdVO3
• Observation of excitons bound by antiferromagnetic correlations
• Diagnosing electronic phases of matter using photonic correlation functions
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• A set-up for Hard X-ray Time-resolved Resonant Inelastic X-ray Scattering at SwissFEL
• Tracking the local order parameter through the Hubbard exciton decoherence time in the Mott-Hubbard insulator LaVO3
• Metal-insulator transition in CaV1-xWxO3 (x=0.1-0.33) perovskites
• Energy current and energy fluctuations in driven quantum wires