Tunneling in suspended carbon nanotubes assisted by longitudinal phonons

Tunneling in suspended carbon nanotubes assisted by longitudinal phonons

Phys. Rev. Lett. 96, 026801 (2006) 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 (...

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Hauptverfasser: Sapmaz, S, Jarillo-Herrero, P, Blanter, Ya. M, Dekker, C, van der Zant, H. S. J
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Blanter, Ya. M
Dekker, C
van der Zant, H. S. J
description Phys. Rev. Lett. 96, 026801 (2006) 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.
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title Tunneling in suspended carbon nanotubes assisted by longitudinal phonons
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