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Time‐dependent suppression of current through molecular junctions
Author(s) -
Li GuangQi,
Schreiber Michael,
Kleinekathöfer Ulrich
Publication year - 2008
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200879862
Subject(s) - quantum tunnelling , electron , condensed matter physics , physics , amplitude , current (fluid) , envelope (radar) , voltage , field (mathematics) , chemistry , laser , biasing , atomic physics , quantum mechanics , telecommunications , radar , mathematics , computer science , pure mathematics , thermodynamics
Using a quantum master equation the electron transport through a molecular junction modeled by a single site weakly coupled to two leads is investigated under the influence of a time‐dependent external field. Extending an earlier study [Europhys. Lett. 79 , 27006 (2007)] the effect of the laser field amplitude is analyzed in detail. The phenomenon of coherent destruction of tunneling is only obtained for small bias voltages. This is because the current through just one channel can be suppressed by the coherent destruction of tunneling. As soon as other channels are open either because of electron–electron interaction or because of the appearance of virtual photon‐assisted states, a non‐vanishing current can be observed. For time‐dependent laser fields the actual value of the envelope function of the field determines whether the current can be suppressed coherently when bias voltage and electron interaction are in the desired parameter range. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)