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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.