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.
Author: | Jörg LehmannGND, Sigmund KohlerORCiDGND, Volkhard May, Peter HänggiORCiDGND |
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URN: | urn:nbn:de:bvb:384-opus4-2900 |
Frontdoor URL | https://opus.bibliothek.uni-augsburg.de/opus4/356 |
Type: | Preprint |
Language: | English |
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: http://jcp.aip.org/jcp/ |
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 |