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HL: Fachverband Halbleiterphysik
HL 75: Transport: Spintronics and magnetotransport 1 (TT, jointly with HL, MA)
HL 75.14: Talk
Thursday, March 14, 2013, 13:00–13:15, H18
Tunable electron-vibron coupling in suspended carbon nanotube quantum dots — •Christoph Stampfer1,2, Peter Weber1,2, Carola Meyer2, and Stefan Trellenkamp2 — 1JARA-FIT and II. Institute of Physics B, RWTH Aachen, 52074 Aachen, Germany — 2Peter-Grünberg-Institut (PGI-6/8/9), Forschungszentrum Jülich, 52425 Jülich, Germany
Measurements through nano electromechanical systems and single-molecule junctions have shown that electronic transport is strongly influenced by the mechanical motion, leading to transport assisted by emission of vibrons. Furthermore, a strong electron-vibron coupling is expected to lead to a suppression of transport through the vibronic ground state, known as Franck-Condon blockade. Here we report on transport in a quantum dot formed in a partly suspended carbon nanotube devices. The data show Coulomb diamonds with a clear fourfold degeneracy and an experimental confirmation of Franck-Condon blockade mechanism. More interestingly, we show that our four-terminal quantum device allows us to tune the electron-vibron coupling. In particular, we focus on the investigation of spin states and the tunability of electron-phonon coupling in the suspended carbon nanotube quantum dot.