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HL: Halbleiterphysik

HL 7: Kohlenstoff/Diamant

HL 7.3: Vortrag

Montag, 24. März 2003, 13:00–13:15, BEY/154

Electron-Phonon Coupling in Carbon Nanotubes — •María Machón¹, Stephanie Reich², José Miguel Pruneda³, Christian Thomsen¹, and Pablo Ordejón² — ¹Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany — ²Institut de Ciència de Materials de Barcelona (CSIC), Campus de la U.A.B. E-08193 Bellaterra, Barcelona, Spain — ³Dept. of Earth Sciences, Cambridge University, Downing Street, CB2 3EQ, Cambridge, U.K.

Electron-phonon interaction plays a key role in a variety of phenomena like light scattering, electrical transport, or superconductivity. We studied the electron-phonon coupling in isolated single-walled nanotubes for fully symmetrical Γ point phonons. By this we aim at understanding the Raman spectra of carbon nanotubes, which are still controversially debated. The electron-phonon matrix elements obtained are based on ab initio calculations of the band stucture of the nanotubes, under the deformation due to the phonon under study. The calculations were performed for armchair and zigzag nanotubes of different diameters between 4 and 15 Å. We discuss the radius and chirality dependence of the matrix elements and compare them with graphene.