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.

8 pages, 4 figures

References in corpus (12)

• The density-matrix renormalization group in the age of matrix product states
• Real time evolution using the density matrix renormalization group
• Trion induced negative photoconductivity in monolayer MoS2
• Photo-induced states in a Mott insulator
• Observation of suppressed terahertz absorption in photoexcited graphene
• Theory of time-resolved optical spectroscopy on correlated electron systems
• Excitons in the One-Dimensional Hubbard Model: a Real-Time Study
• Emergent ultrafast phenomena in correlated oxides and heterostructures
• Photoinduced in-gap excitations in the one-dimensional extended Hubbard model
• Biexciton in one-dimensional Mott insulators
• Photoexcitation of electronic instabilities in one-dimensional charge-transfer systems
• A charge model as an effective model of one-dimensional Hubbard and extended Hubbard systems: its application to linear optical spectrum calculations in large systems based upon many-body Wannier functions

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