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 F;Sassetti M
2010

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.
2010
Istituto Superconduttori, materiali innovativi e dispositivi - SPIN
Theory of electronic quantum transport; nanoelectromechanical systems; PACS numbers: 73.23.-b
85.85.+j
73.63.Kv
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.14243/31101
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