Berlin 2008 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 22: Transport: Poster Session
TT 22.40: Poster
Mittwoch, 27. Februar 2008, 14:00–18:00, Poster B
Non-Equilibrium Energy Gaps and Inelastic Transport in Carbon Nanotubes: Role of Phonon Symmetries — •Luis Foa Torres1, Rémi Avriller2, and Stephan Roche2 — 1Institute for Materials Science, Dresden University of Technology, D-01062 Dresden, Germany. — 2DSM/DRFMC/SPSMS/GT, Commissariat à l'Energie Atomique, 17 rue des Martyrs, 38054 Grenoble, France.
We report on a theoretical study of inelastic basckscattering and transport in metallic carbon nanotubes. A Peierls-type mechanism due to electron-phonon interaction with longitudinal optic as well as K point modes [1] in armchair tubes is shown to induce non-equilibrium energy gaps, which in turn manifest as plateaus in the current-voltage characteristics as soon as optic modes are activated. The precise features of these plateaus depend on the specifics of the coupling with the environment through the thermalization rate of the phonons. These phenomena are unveiled by using a full quantum description of the joined processes of tunneling and phonon-assisted transport and can be seen as the removal of degeneracies in Fock space. Further generalizations to tubes of arbitrary helicity are also outlined [1] thereby giving a much broader reach to previously reported results [2].
[1] L. E. F. Foa Torres, R. Avriller and S. Roche, submitted.
[2] L. E. F. Foa Torres and S. Roche, Phys. Rev. Lett. 97 (2006) 076804.