Regensburg 2016 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 54: Transport: Carbon Nanotubes
TT 54.1: Vortrag
Mittwoch, 9. März 2016, 15:00–15:15, H22
Carbon nanotubes in high magnetic field — •Magdalena Marganska1, Peter L. Stiller2, Alois Dirnaichner2, Daniel R. Schmid2, Michael Niklas1, Andreas K. Hüttel2, Christoph Strunk2, and Milena Grifoni1 — 1Institute for Theoretical Physics, University of Regensburg, 93053 Regensburg, Germany — 2Institute of Experimental and Applied Physics, University of Regensburg, 93053 Regensburg, Germany
A parallel magnetic field affects strongly the electronic transport through a carbon nanotube (CNT) via its coupling to the orbital degree of freedom. Although such a wire-like system can host neither the fully developed Hofstadter butterflies nor Landau levels, the magnetic field has nevertheless a deep influence on the CNT's spectrum and wave functions. We report here on the results of both theoretical calculations and experimental measurements of a CNT quantum dot. The two experimental results on which we focus are a strong suppression of the conductance by the parallel magnetic field and an unusual evolution of the spectral lines. The unique boundary conditions, which couple the transverse and longitudinal momentum, are responsible both for decreased transmission through the CNT and for the remarkable dependence of the longitudinal momentum on the magnetic field.