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dc.contributor.authorMariani, Eros
dc.contributor.authorvon Oppen, Felix
dc.date.accessioned2013-06-24T15:17:07Z
dc.date.issued2009
dc.description.abstractMotivated by recent experiments, we investigate the electron-vibron coupling in suspended carbon nanotube quantum dots, starting with the electron-phonon coupling of the underlying graphene layer. We show that the coupling strength depends sensitively on the type of vibron and is strongly sample dependent. The coupling strength becomes particularly strong when inhomogeneity-induced electronic quantum dots are located near regions where the vibronic mode is associated with large strain. Specifically, we find that the longitudinal stretching mode and the radial breathing mode are coupled via the strong deformation potential, while twist modes couple more weakly via a mechanism involving modulation of the electronic hopping amplitudes between carbon sites. A special case are bending modes: for symmetry reasons, their coupling is only quadratic in the vibron coordinate. Our results can explain recent experiments on suspended carbon nanotube quantum dots, which exhibit vibrational sidebands accompanied by the Franck-Condon blockade with strong electronvibron coupling.en_GB
dc.identifier.citationVol. 80 (15), article 155411en_GB
dc.identifier.doi10.1103/PhysRevB.80.155411
dc.identifier.urihttp://hdl.handle.net/10871/11364
dc.language.isoenen_GB
dc.publisherAmerican Physical Societyen_GB
dc.relation.urlhttp://link.aps.org/doi/10.1103/PhysRevB.80.155411en_GB
dc.relation.urlhttp://dx.doi.org/10.1103/PhysRevB.80.155411en_GB
dc.subjectconductanceen_GB
dc.subjecttransistoren_GB
dc.subjectvibrationsen_GB
dc.subjectmoleculeen_GB
dc.subjectGrapheneen_GB
dc.titleElectron-vibron coupling in suspended carbon nanotube quantum dotsen_GB
dc.typeArticleen_GB
dc.date.available2013-06-24T15:17:07Z
dc.identifier.issn1098-0121
exeter.article-number155411
dc.descriptionCopyright © 2009 The American Physical Societyen_GB
dc.identifier.eissn1550-235X
dc.identifier.journalPhysical Review B - Condensed Matter and Materials Physicsen_GB


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