Electronic states and vibrons in carbon nanotube quantum dots have, in general, different location and size. As a consequence, the conventional Anderson-Holstein model, coupling vibrons to the dot total charge only, may no longer be appropriated in general. Here we explicitly address the role of the spatial fluctuations of the electronic density, yielding space-dependent Franck-Condon factors. We discuss the consequent marked effects on transport which are compatible with recent measurements. This picture can be relevant for tunneling experiments in generic nanoelectromechanical systems.
Asymmetric Franck-Condon factors in suspended carbon nanotube quantum dots
CAVALIERE, FABIO;SASSETTI, MAURA
2010-01-01
Abstract
Electronic states and vibrons in carbon nanotube quantum dots have, in general, different location and size. As a consequence, the conventional Anderson-Holstein model, coupling vibrons to the dot total charge only, may no longer be appropriated in general. Here we explicitly address the role of the spatial fluctuations of the electronic density, yielding space-dependent Franck-Condon factors. We discuss the consequent marked effects on transport which are compatible with recent measurements. This picture can be relevant for tunneling experiments in generic nanoelectromechanical systems.
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