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arXiv · 0911.2141

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

Luis G. G. V. Dias da Silva·Khaled A. Al-Hassanieh·Adrian E. Feiguin·Fernando A. Reboredo·Elbio Dagotto
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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.

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Luis G. G. V. Dias da Silva, Khaled A. Al-Hassanieh, Adrian E. Feiguin, Fernando A. Reboredo, Elbio Dagotto. 2010-03-21. Real-time dynamics of particle-hole excitations in Mott insulator-metal junctions. https://doi.org/10.1103/physrevb.81.125113

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