Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-11-11
Phys. Rev. B 81, 125113 (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
Published version. 9 pages, 10 figures
Scientific paper
10.1103/PhysRevB.81.125113
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.
Al-Hassanieh Khaled A.
da Silva Luis G. G. V. Dias
Dagotto Elbio
Feiguin Adrian E.
Reboredo Fernando A.
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