Nonequilibrium optical response of a one-dimensional Mott insulator

Julián Rincón and Adrian E. Feiguin
Phys. Rev. B 104, 085122 – Published 13 August 2021

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.

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  • Received 9 April 2021
  • Revised 4 August 2021
  • Accepted 5 August 2021

DOI:https://doi.org/10.1103/PhysRevB.104.085122

©2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied PhysicsAtomic, Molecular & OpticalNetworks

Authors & Affiliations

Julián Rincón1 and Adrian E. Feiguin2

  • 1School of Science, Engineering and Technology, Universidad del Rosario, Bogotá D.C. 111711, Colombia
  • 2Department of Physics, Northeastern University, Boston, Massachusetts 02115, USA

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Issue

Vol. 104, Iss. 8 — 15 August 2021

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