Real-time dynamics of particle-hole excitations in Mott insulator-metal junctions

Abstract

Charge excitations in Mott insulators (MIs) are distinct from their band-insulator counterparts and they can provide a mechanism for energy harvesting in solar cells based on strongly correlated electronic materials. In this paper, we study the real-time dynamics of holon-doublon pairs in a MI connected to metallic leads using the time-dependent density matrix renormalization group method. The transfer of charge across the MI-metal interface is controlled by both the electron-electron interaction strength within the MI and the voltage difference between the leads. We find an overall enhancement of the charge transfer as compared to the case of a (noninteracting) band insulator-metal interface with a similar band gap. Moreover, the propagation of holon-doublon excitations within the MI dynamically changes the spin-spin correlations, introducing time-dependent phase shifts in the spin structure factor.

Published version. 9 pages, 10 figures

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• Time Evolution with the DMRG Algorithm: A Generic Implementation for Strongly Correlated Electronic Systems
• Quantum spin torque driven transmutation of antiferromagnetic Mott insulator
• Dynamics of doublon-holon pairs in Hubbard two-leg ladders
• Density of States and Magnetic Correlations at a Metal-Mott Insulator Interface
• Quantum interference-induced stability of repulsively bound pairs of excitations
• Transient dynamics of a magnetic impurity coupled to superconducting electrodes: exact numerics versus perturbation theory
• Low-energy doublons in the ac-driven two-species Hubbard model
• Relaxation of photoexcitations in polaron-induced magnetic microstructures
• Relaxation of Fermionic Excitations in a Strongly Attractive Fermi Gas in an Optical Lattice
• Density-matrix renormalization group study of the linear conductance in quantum wires coupled to interacting leads or phonons