Article (Scientific journals)
Lifting the Franck-Condon blockade in driven quantum dots
Haughian, Patrick; Walter, Stefan; Nunnenkamp, Andreas et al.
2016In Physical Review. B, Condensed Matter, 94
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Keywords :
nanomechanics; quantum transport; carbon nanotubes
Abstract :
[en] Electron-vibron coupling in quantum dots can lead to a strong suppression of the average current in the sequential tunneling regime. This effect is known as Franck-Condon blockade and can be traced back to an overlap integral between vibron states with different electron numbers which becomes exponentially small for large electron-vibron coupling strength. Here, we investigate the effect of a time-dependent drive on this phenomenon, in particular the effect of an oscillatory gate voltage acting on the electronic dot level. We employ two different approaches: perturbation theory based on nonequilibrium Keldysh Green's functions and a master equation in Born-Markov approximation. In both cases, we find that the drive can lift the blockade by exciting vibrons. As a consequence, the relative change in average current grows exponentially with the drive strength.
Disciplines :
Physics
Author, co-author :
Haughian, Patrick ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Walter, Stefan;  Friedrich-Alexander-Universität Erlangen-Nürnberg - FAU > Institut für theoretische Physik II
Nunnenkamp, Andreas;  University of Cambridge > Cavendish Laboratory
Schmidt, Thomas ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
External co-authors :
yes
Language :
English
Title :
Lifting the Franck-Condon blockade in driven quantum dots
Publication date :
10 November 2016
Journal title :
Physical Review. B, Condensed Matter
ISSN :
1095-3795
Publisher :
American Institute of Physics, New York, United States - New York
Volume :
94
Peer reviewed :
Peer Reviewed verified by ORBi
Focus Area :
Physics and Materials Science
FnR Project :
FNR7556175 - Modern Mesoscopic Systems And Applications In Nanoelectronics And Spintronics, 2014 (01/02/2015-31/07/2021) - Thomas Schmidt
Funders :
FNR - Fonds National de la Recherche [LU]
ERC OPTOMECH
Marie Curie ITN cQOM
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