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 21.5: Talk

Monday, March 11, 2013, 16:00–16:15, H18

Mapping out the band structure of carbon nanotubes in a magnetic field: part I, experiment — •Alois Dirnaichner, Daniel Schmid, Magdalena Marganska, Milena Grifoni, Andreas K. Hüttel, and Christoph Strunk — University of Regensburg, 93040 Regensburg, Germany

We report on electronic transport spectroscopy measurements on an ultra-clean carbon nanotube as a quantum dot at low temperature and finite magnetic field. The direction of the magnetic field can be adjusted both parallel and perpendicular to the nanotube axis with flux densities of up to B=17 T. Data focusses on the few-electron spectrum, highly regular down to N_el=1, where sharp Coulomb blockade oscillations enable tracing of multiple excited quantum states. We discuss spin-orbit coupling and KK’-mixing in our sample. The data is compared to state-of-the art CNT modeling.