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Condensed Matter > Strongly Correlated Electrons
Title: Nonequilibrium optical response of a one-dimensional Mott insulator
(Submitted on 31 Dec 2020 (v1), last revised 18 Aug 2021 (this version, v2))
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.
Submission history
From: Julian Rincon [view email][v1] Thu, 31 Dec 2020 15:22:32 GMT (1536kb,D)
[v2] Wed, 18 Aug 2021 14:58:01 GMT (1537kb,D)
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