Vibrational effects in laser driven molecular wires

  • The influence of an electron-vibrational coupling on the laser control of electron transport through a molecular wire that is attached to several electronic leads is investigated. These molecular vibrational modes induce an effective electron-electron interaction. In the regime where the wire electrons couple weakly to both the external leads and the vibrational modes, we derive within a Hartree-Fock approximation a nonlinear set of quantum kinetic equations. The quantum kinetic theory is then used to evaluate the laser driven, time-averaged electron current through the wire-leads contacts. This novel formalism is applied to two archetypical situations in the presence of electron-vibrational effects, namely, (i) the generation of a ratchet or pump current in a symmetrical molecule by a harmonic mixing field and (ii) the laser switching of the current through the molecule.

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Author:Jörg LehmannGND, Sigmund KohlerORCiDGND, Volkhard May, Peter HänggiORCiDGND
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Publishing Institution:Universität Augsburg
Release Date:2006/09/05
Tag:vibrational modes; laser beam effects; electron transport theory; quantum theory; kinetic theory
GND-Keyword:Molekularer Draht; Transportprozess; Kinetische Theorie; Quantentheorie; Schwingung; Laserstrahlung
Source:erschienen in: J. Chem. Phys. 121, 2278–2288 (2004) ; DOI: 10.1063/1.1768154; URL:
Institutes:Mathematisch-Naturwissenschaftlich-Technische Fakultät
Mathematisch-Naturwissenschaftlich-Technische Fakultät / Institut für Physik
Mathematisch-Naturwissenschaftlich-Technische Fakultät / Institut für Physik / Lehrstuhl für Theoretische Physik I
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik