Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 88: Transport: Carbon Nanotubes
TT 88.2: Vortrag
Donnerstag, 19. März 2015, 09:45–10:00, A 053
Influence of spin-orbit interaction and chirality on Fabry-Perot interference in carbon nanotubes — •Alois Dirnaichner1, Miriam del Valle2, Karl Götz1, Felix Schupp1, Andreas K. Hüttel1, Christoph Strunk1, and Milena Grifoni2 — 1Institute of Experimental and Applied Physics, University of Regensburg — 2Institute for Theoretical Physics, University of Regensburg
For highly transparent contact interfaces a carbon nanotube can be described as an electronic Fabry-Perot interferometer combining weak scattering at the contacts with a one-dimensional ballistic waveguide. In experiments on clean single wall carbon nanotubes we observe complex gate and bias voltage dependent interference patterns in conductance. This includes slow envelope beats as well as an apparent frequency doubling. Using an analytical scattering matrix model as well as numerical tight-binding calculations we show that such complex interference patterns can arise from the chirality and the spin-orbit interaction of a nanotube. Theoretical expectations for different types of nanotubes are compared with the experiment.