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TT: Fachverband Tiefe Temperaturen

TT 18: Nanoelectronics I - Quantum Dots, Wires, Point Contacts

TT 18.10: Vortrag

Mittwoch, 28. März 2007, 16:30–16:45, H19

Transport properties of double-wall nanotubes in parallel magnetic field — •Magdalena Marganska, Shidong Wang, and Milena Grifoni — Institut für Theoretische Physik, Universität Regensburg, 93040 Regensburg, Germany

We study the quantum transport in disorder-free double-wall carbon nanotubes in the presence of a parallel magnetic field. The diffusion exponent, both spectrum-averaged and as a function of energy is obtained by calculating the multi-fractal dimension of the energy spectrum in the corresponding energy range. In the absence of the magnetic field the spreading of a wave packet along the nanotube can be ballistic or anomalous diffusive depending on the degree of incommensurability between shells and on the considered energy range. The coupling between shells is modified by the magnetic field via the Peierls phase, which causes a change in the energy spectrum. This has a complex structure, periodic in B, which depends on the relative chiralities of the shells.