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TT: Fachverband Tiefe Temperaturen
TT 51: TR: Nanoelectronics I - Quantum Dots, Wires, Point Contacts 2
TT 51.4: Talk
Thursday, March 17, 2011, 14:45–15:00, HSZ 304
Pseudo-spin-dependent scattering in carbon nanotubes — •Leonhard Mayrhofer1 and Dario Bercioux2,3 — 1Fraunhofer IWM, Wöhlerstrasse 11, D-79108 Freiburg, Germany — 2Freiburg Institute for Advanced Studies, Albert-Ludwigs-Universität, D-79104 Freiburg, Germany — 3Physikalisches Institut, Albert-Ludwigs- Universität, D-79104 Freiburg, Germany
We investigate the electronic scattering properties of defected armchair single-walled carbon nanotubes with analytical and numerical methods [1]. By analyzing the local density of states and its Fourier transform we show that electron scattering at defects in carbon nanotubes is strongly affected by the pseudo-spin of the electrons. Depending on the defect symmetry pseudo-spin is conserved or not. In addition, the investigation reveals that the lattice reconstruction of the energetically favored 5-8-5 di-vacancy defects, breaking particle-hole symmetry, is responsible for the pseudo-spin selection rules observed in the experiments by Ouyang et al. [2]. Comparison with other experiments is also reported [3,4].
L. Mayrhofer and D. Bercioux, arXiv:1009.4839.
M. Ouyang et al., Phys. Rev. Lett. 88, 066804 (2002).
J. Lee et al., Phys Rev Lett. 93, 166403 (2004).
G. Buchs et al., Phys. Rev. Lett. 102, 245505 (2009).