TY - JOUR
T1 - Light-induced current in molecular junctions
T2 - Local field and non-Markov effects
AU - Fainberg, Boris D.
AU - Sukharev, Maxim
AU - Park, Tae Ho
AU - Galperin, Michael
PY - 2011/5/23
Y1 - 2011/5/23
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.83.205425
DO - 10.1103/PhysRevB.83.205425
M3 - Article
AN - SCOPUS:79961119166
SN - 1098-0121
VL - 83
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 20
M1 - 205425
ER -