Coupling between electronic and vibrational excitations in carbon nanotubes filled with C60 fullerenes
Résumé
We investigate the low-temperature electron transport through C 60 peapods, which are carbon nanotubes encapsulating C60 fullerenes. We find that the temperature dependence of the Coulomb blockade oscillations in peapod quantum dots deviates from conventional Breit-Wigner behavior, showing signatures of the Franck-Condon blockade of conductance. This indicates the presence of a coupling between electronic states and vibrational excitations. Unlike for suspended empty nanotubes, these are not intrinsic vibrational modes of the tube but mechanical vibrations of the encapsulated fullerenes that affect the electronic transport. Fullerene peapods thus emerge as a new class of nanoelectromechanical systems.
Mots clés
Carbon
Carbon nanotubes
Coulomb blockade
Electron transport properties
Excited states
Fullerenes
Nanotubes
Semiconductor quantum dots
Temperature
Temperature distribution
Yarn
Coulomb blockade oscillation
Electron transport
Electronic transport
Fullerene peapods
Low temperatures
Temperature dependence
Vibrational excitation
Vibrational modes
Vibrations (mechanical)