Mechanism for Synchronization of Charge Oscillations in Dimer Lattices

Abstract

We discuss the mechanism and the conditions for the appearance of synchronized charge oscillations which have been observed experimentally and theoretically after strong photoexcitation of dimerized systems. In the Hubbard model with on-site repulsion, the Bloch equations for a wave-number-dependent pseudospin -- whose components describe the charge-density difference, current density, and bond density between the two sublattices -- involve an alternatingly tilted pseudomagnetic field, which assists the synchronization of pseudospins with different wave numbers, irrespective of the initial condition. This fact is numerically confirmed by the dynamics in finite lattices based on the exact diagonalization method. In the presence of nearest-neighbor repulsion, however, the synchronization can be hindered by excitons. Therefore, the excitation of a sufficiently large density of free electron-hole pairs, but low density of excitons, is needed to achieve synchronization.

arXiv comment9 pages, 8 figures

References in corpus (43)

• The Kuramoto model in complex networks
• Sub-cycle control of terahertz high-harmonic generation by dynamical Bloch oscillations
• An optically stimulated superconducting-like phase in K3C60 far above equilibrium Tc
• Electrodynamics of Correlated Electron Materials
• Ultrafast switching to a stable hidden topologically protected quantum state in an electronic crystal
• Ultrafast optical spectroscopy of strongly correlated materials and high-temperature superconductors: a non-equilibrium approach
• Unconventional critical behaviour in a quasi-two-dimensional organic conductor
• Optically induced coherent transport far above Tc in underdoped YBa2Cu3O6+x
• Solitons and Rabi Oscillations in a Time-Dependent BCS Pairing Problem
• Nonlinear light-matter interaction at terahertz frequencies
• High harmonic imaging of ultrafast many-body dynamics in strongly correlated systems
• Ultrafast Electronic Band Gap Control in an Excitonic Insulator
• Theory of Anderson pseudospin resonance with Higgs mode in superconductors
• Anomalous dielectric response in the dimer Mott insulator $\kappa$-(BEDT-TTF)${}_2$Cu${}_2$(CN)${}_3$
• Quantum interference between charge excitation paths in a solid state Mott insulator
• High-Harmonic Generation in Mott Insulators
• Nonthermal antiferromagnetic order and nonequilibrium criticality in the Hubbard model
• Dynamical band flipping in fermionic lattice systems: An ac-field-driven change of the interaction from repulsive to attractive
• The Paired Electron Crystal: order from frustration in the quarter-filled band
• Photo-induced enhancement of excitonic order
• Optical freezing of charge motion in an organic conductor
• How Circular Dichroism in time- and angle-resolved photoemission can be used to spectroscopically detect transient topological states in graphene
• Dynamical synchronization transition in interacting electron systems
• Photoinduced Enhancement of the Charge Density Wave Amplitude
• Collective excitation of electric dipole on molecular dimer in organic dimer-Mott insulator
• Repulsion-to-attraction transition in correlated electron systems triggered by a monocycle pulse
• Ultrafast coupled charge and spin dynamics in strongly correlated NiO
• Purely electronic THz polarization in dimer Mott insulators
• Double-Exchange Interaction in Optically Induced Nonequilibrium State: A Conversion from Ferromagnetic to Antiferromagnetic Structure
• Coupling-dependent rates of energy transfers from photoexcited Mott insulators to lattice vibrations
• Floquet-Theoretical Formulation and Analysis of High-Harmonic Generation in Solids
• High-harmonic generation in spin-orbit coupled systems
• Non-linear charge oscillation driven by a single-cycle light-field in an organic superconductor
• Photoinduced enhancement of excitonic order in the two-orbital Hubbard model
• Strong light-field effects driven by nearly single-cycle 7-fs light field in correlated organic conductors
• Photoexcitation-Energy-Dependent Transition Pathways from a Dimer Mott Insulator to a Metal
• Nonthermal excitonic condensation near a spin-state transition
• Optical manipulation of magnetism in spin-charge coupled correlated electron system
• Effects of frustration on the nonequilibrium dynamics of photo-excited lattice systems
• Strong terahertz radiation via rapid polarization reduction in photoinduced ionic-to-neutral transition of tetrathiafulvalene-p-chloranil
• Charge Oscillations Emerging after Application of an Intense Light Field to Superconductors on a Dimer Lattice
• Photoinduced High-Frequency Charge Oscillations in Dimerized Systems
• Competition between Interactions and Randomness in Photoinduced Synchronization of Charge Oscillations on a Dimer Lattice