Tunneling in suspended carbon nanotubes assisted by longitudinal phonons

Tunneling in suspended carbon nanotubes assisted by longitudinal phonons

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. A...

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Veröffentlicht in:Physical review letters 2006-01, Vol.96 (2), p.026801-026801
Hauptverfasser: Sapmaz, S, Jarillo-Herrero, P, Blanter, Ya M, Dekker, C, van der Zant, H S J
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Jarillo-Herrero, P
Blanter, Ya M
Dekker, C
van der Zant, H S J
description 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. A 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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