Regensburg 2013 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 21: Transport: Quantum dots, wires, point contacts 2 (TT, jointly with HL)

HL 21.6: Talk

Monday, March 11, 2013, 16:30–16:45, H18

Mapping out the band structure of carbon nanotubes in a magnetic field: part II, theory — •Magdalena Marganska, Alois Dirnaichner, Daniel Schmid, Andreas K. Hüttel, Christoph Strunk, and Milena Grifoni — University of Regensburg, Germany

We report here an analysis of transport measurements of ultraclean carbon nanotubes in parallel magnetic field. Employing the magnetic field dependence of the energies of ground and excited states of a single excess electron in the CNT-quantum dot we can assign a diameter and chirality to the nanotube present in the device. The data obtained in low fields allow us to extract several of the nanotube parameters, and to refine the minimal Hamiltonian commonly used for CNT quantum dots in parallel magnetic fields. With an additional asymmetry term appearing in the Hamiltonian, we can match the experimental data with high accuracy. Using the results from high magnetic fields we can further refine our analysis and identify the term responsible for electron-hole asymmetry in the spin-orbit splitting.