Site-selective doublon-holon dynamics in a pumped one-dimensional Hubbard superlattice with staggered Coulomb interactions

Abstract

Doublon-holon dynamics is investigated in a pumped one-dimensional Hubbard model with a staggered on?site Coulomb interaction at half-filling. When the system parameters are set to be in the Mott insulating regime the equilibrium sublattice density of states exhibits several characteristic peaks, corresponding to the lower and upper Hubbard bands as well as hybridization bands. We study the linear absorption spectrum and find two main peaks characterizing the photon frequencies which excite the ground state to an excited state. For a system driven by a laser pulse with general intensity and frequency, both the energy absorption and the doublon-holon dynamics exhibit distinct behaviors as a function of laser amplitude and frequency. Single-photon processes are observed at low laser intensity where the energy is absorbed for resonance laser frequencies. For strong laser intensity multi-photon induced dynamics are observed in the system, which are confirmed by an evaluation of the Loschmidt amplitude. The contribution of multi-photon processes to site-specific double occupancy is also characterized by the generalized Loschmidt amplitude. The site-selective doublon-holon dynamics are observed in both the one and multi-photon processes and the site-selective behavior is explained within a quasiparticle picture. Our study suggests strategies to optically engineer the doublon-holon dynamics in one dimensional strongly correlated many-body systems.

10 pages, 7 figures

References in corpus (16)

• Nonthermal pathways to ultrafast control in quantum materials
• Non-thermal fixed points: effective weak-coupling for strongly correlated systems far from equilibrium
• Disentangling the electronic and phononic glue in a high-Tc superconductor
• Time Dependent Variational Principle with Ancillary Krylov Subspace
• Orbital-selective Mott transitions: Heavy fermions and beyond
• Excitons in the One-Dimensional Hubbard Model: a Real-Time Study
• Flavour-selective localization in interacting lattice fermions via SU(N) symmetry breaking
• Enhanced charge order in a photoexcited one-dimensional strongly correlated system
• Exploring nonequilibrium phases of photo-doped Mott insulators with Generalized Gibbs ensembles
• Photoinduced $\eta$-pairing at finite temperatures
• Magnetism, transport, and thermodynamics in two-dimensional half-filled Hubbard superlattices
• Dynamics of doublon-holon pairs in Hubbard two-leg ladders
• Impact ionization processes in a photodriven Mott insulator: influence of phononic dissipation
• Mott transitions in the Hubbard model with spatially-modulated interactions
• Pump-probe spectroscopy of the one-dimensional extended Hubbard model at half filling
• Photoexcitations in the Hubbard model -- generalized Loschmidt amplitude analysis of impact ionization in small clusters

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• A new pathway to impact ionization in a photo-excited one-dimensional ionic Hubbard model
• Laser-Induced Commensurate-Incommensurate Transition of Charge Order in a Hubbard Superlattice