Tunneling in suspended carbon nanotubes assisted by longitudinal phonons

Abstract

Current-voltage characteristics of suspended single-wall carbon nanotube quantum dots show a series of steps equally spaced in voltage. The energy scale of this harmonic, low-energy excitation spectrum is consistent with that of the longitudinal low-k phonon mode (stretching mode) in the nanotube. Agreement is found with a Franck-Condon-based model in which the phonon-assisted tunneling process is modeled as a coupling of electronic levels to underdamped quantum harmonic oscillators. Comparison with this model indicates a rather strong electron-phonon coupling factor of order unity.

4 pages

References in corpus (5)

• A tunable carbon nanotube electromechanical oscillator
• Franck-Condon blockade and giant Fano factors in transport through single molecules
• Electrical generation and absorption of phonons in carbon nanotubes
• Vibrational sidebands and dissipative tunneling in molecular transistors
• Single-electron Tunneling with Strong Mechanical Feedback

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