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TT: Fachverband Tiefe Temperaturen

TT 33: Nanotubes and Nanoribbons

TT 33.6: Vortrag

Dienstag, 13. März 2018, 10:45–11:00, H 0110

Dark states in a carbon nanotube quantum dot - theory — Michael Niklas¹, Michael Schafberger², •Andrea Donarini¹, Nicola Paradiso², Christoph Strunk², and Milena Grifoni¹ — ¹Institute of Theoretical Physics, University of Regensburg, 93053 Regensburg, Germany — ²Institute of Experimental and Applied Physics, University of Regensburg, 93053 Regensburg, Germany

The dark states are the key to interpret the transport characteristics of a class of single electron transistors based on carbon nanotubes (CNT) quantum dots. The emergence of the dark states relies on the (quasi) valley degeneracy of the CNT and on the particular coupling to the metallic leads. The difference between the tunneling phases to the two electrodes is the most relevant parameter of the theory. Besides characterizing the dark states, this phase difference determines also the precession dynamics of the pseudospin associated to the orbital degeneracy. This theory predicts current suppression with a specific gate and bias dependence which accurately matches the experimental results.