Nonequilibrium optical response of a one-dimensional Mott insulator

Rincón, Julián; Feiguin, Adrian E.

doi:10.1103/physrevb.104.085122

Title: Nonequilibrium optical response of a one-dimensional Mott insulator

Journal Article · 12 August 2021 · Physical Review. B

DOI: https://doi.org/10.1103/physrevb.104.085122 · OSTI ID:1851916

^[1]; Feiguin, Adrian E. ^[2]

Universidad del Rosario, Bogota (Colombia); OSTI
Northeastern Univ., Boston, MA (United States)

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.

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Research Organization:: Northeastern University, Boston, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0014407

OSTI ID:: 1851916

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 8 Vol. 104; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Nonequilibrium optical response of a one-dimensional Mott insulator

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