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.
Keywords
Cite
@article{arxiv.0911.2141,
title = {Real-time dynamics of particle-hole excitations in Mott insulator-metal junctions},
author = {Luis G. G. V. Dias da Silva and Khaled A. Al-Hassanieh and Adrian E. Feiguin and Fernando A. Reboredo and Elbio Dagotto},
journal= {arXiv preprint arXiv:0911.2141},
year = {2010}
}
Comments
Published version. 9 pages, 10 figures