Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 58: Transport: Poster Session

TT 58.37: Poster

Mittwoch, 9. März 2016, 15:00–18:30, Poster D

Magnetic field induced electron-vibron coupling in a carbon nanotube quantum dot — •Peter Stiller, Daniel Schmid, Christoph Strunk, and Andreas Hüttel — Institute for Experimental and Applied Physics, University of Regensburg, 93040 Regensburg, Germany

Quantum dots defined in suspended single wall carbon nanotubes define a nano-electromechanical system where clear quantized harmonic oscillator behaviour becomes visible. We present transport measurements on a clean nanotube device tuned to the few electron regime, i.e., having a highly localized electronic system. Here, we demonstrate the emergence of Franck-Condon sidebands in single electron tunneling, corresponding to the longitudinal vibration, induced by a finite magnetic field along the carbon nanotube axis. The Franck-Condon coupling factor g increases with magnetic field and saturates at B ≈ 5 T. The behaviour of the sidebands attached to different electronic quantum states is compared, and tentative models are discussed.