Abstract Submitted to the NANOTUBE'05 Conference:

We have performed low temperature scanning tunneling spectroscopy on individual single-wall carbon nanotubes freely suspended over trenches. Spatially resolved spectroscopy shows a Coulomb-staircase behavior superimposed on the local density of states [1]. In addition to the Coulomb peaks from the addition of electrons, side peaks appear due to phonon-assisted tunneling [2]. Electrons inelastically tunneling into the nanotube cause a non-equilibrium phonon occupation, leading to both emission and absorption of phonons by successive tunneling electrons. The addition of a gate electrode into our STM configuration[3] allows further validation of this interpretation. These observations represent a new class of electrical transport phenomena, namely a current induced non-equilibrium phonon distribution and its influence on transport through a molecule.

References:
[1] LeRoy et al., Appl. Phys. Lett. 84, 4280 (2004)
[2] LeRoy et al., Nature 432, 371 (2004)
[3] Kong et al., Appl. Phys. Lett. 86, 112106 (2005)

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