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TT: Fachverband Tiefe Temperaturen

TT 51: TR: Nanoelectronics I - Quantum Dots, Wires, Point Contacts 2

TT 51.3: Vortrag

Donnerstag, 17. März 2011, 14:30–14:45, HSZ 304

Magnetic field-induced localization in carbon nanotubes — •Magdalena Marganska, Miriam del Valle, Sung Ho Jhang, Christoph Strunk, and Milena Grifoni — University of Regensburg, Regensburg, Germany

The electronic spectra of long carbon nanotubes (CNTs) can, to a very good approximation, be obtained using the dispersion relation of graphene with both angular and axial periodic boundary conditions. In short CNTs one must account for the presence of open ends, which in some CNTs may give rise to states localized at the edges. We show that when a magnetic field is applied parallel to the tube axis, it modifies both momentum quantization conditions, causing hitherto extended states to localize near the ends. The localization is gradual and at low magnetic fields the involved states are still extended. This effect occurs in nanotubes of any size and chirality except armchair. We derive our results using the tight-binding model including the nanotube curvature.