Nonequilibrium optical response of a one-dimensional Mott insulator

Abstract

We define, compute and analyze the nonequilibrium differential optical conductivity of the one-dimensional extended Hubbard model at half-filling after applying a pump pulse, using the time-dependent density matrix renormalization group method. The melting of the Mott insulator is accompanied by a suppression of the local magnetic moment and ensuing photogeneration of doublon-holon pairs. The differential optical conductivity reveals $(i)$ mid-gap states related to parity-forbidden optical states, and $(ii)$ strong renormalization and hybridization of the excitonic resonance and the absorption band, yielding a Fano resonance. We offer evidence and interpret such a resonance as a signature of nonequilibrium optical excitations resembling excitonic strings, (bi)excitons, and unbound doublon-holon pairs, depending on the magnitude of the intersite Coulomb repulsion. We discuss our results in the context of pump and probe spectroscopy experiments on organic Mott insulators.

arXiv comment8 pages, 4 figures

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Cited by in corpus (4)

• Nonequilibrium dynamics in pumped Mott insulators
• Glassy dynamics of the one-dimensional Mott insulator excited by a strong terahertz pulse
• Wannier-Stark ladders and Stark shifts of excitons in Mott insulators
• Controlling inversion and time-reversal symmetries by subcycle pulses in the one-dimensional extended Hubbard model