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TT: Fachverband Tiefe Temperaturen
TT 54: Transport: Carbon Nanotubes
TT 54.3: Talk
Wednesday, March 9, 2016, 15:30–15:45, H22
Franck-Condon physics in a few-electron nanotube quantum dot — Peter L. Stiller, Daniel R. Schmid, Christoph Strunk, and •Andreas K. Hüttel — Institute for Experimental and Applied Physics, Universität Regensburg, Regensburg, Germany
Franck-Condon sidebands in the transport spectroscopy of suspended carbon nanotubes provide a beautiful nano-electromechanical model system where quantized harmonic oscillator behaviour becomes visible. We present measurements on a strongly localized few-electron system (0≤ Nel ≤ 2), where the coupling of single electron tunneling and vibrational motion arises solely at finite magnetic fields parallel to the carbon nanotube axis. The Franck-Condon parameter g increases with magnetic field and saturates above B≈ 4 T. The behaviour of the sidebands dressing the electronic ground and excited quantum state resonances is compared, and tentative models are discussed.