Light-induced current in molecular junctions: Local field and non-Markov effects

Boris D. Fainberg, Maxim Sukharev, Tae Ho Park, Michael Galperin

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

We consider a two-level system coupled to contacts as a model for a charge pump under external laser pulse. The model represents a charge-transfer molecule in a junction and is a generalization of previously published results. Effects of local field for realistic junction geometries and non-Markov response of the molecule are taken into account within finite-difference time-domain and on-the-contour equation-of-motion formulations, respectively. We find that contrary to the symmetric behavior of the pump relative to the chirp sign, the duration of the corresponding local-field pulse does depend on the chirp sign, which results in an asymmetric charge pumping. The most effective charge-pump regime is found at positive bias, contrary to Markov consideration of the previous study.

Original languageEnglish (US)
Article number205425
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume83
Issue number20
DOIs
StatePublished - May 23 2011

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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