Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 64: Poster Session: Transport
TT 64.12: Poster
Donnerstag, 4. April 2019, 15:00–18:30, Poster D
Optomechanics of a suspended carbon nanotube quantum dot coupled to a coplanar microwave resonator — Stefan Blien, Patrick Steger, •Niklas Hüttner, Richard Graaf, and Andreas K. Hüttel — Institute for Experimental and Applied Physics, Universität Regensburg, Regensburg, Germany
A clean, suspended single wall carbon nanotube is the ultimate limit of a nanomechanical beam resonator, where the fundamental transversal vibration mode reaches resonance frequencies on the order of 100MHz – 1 GHz and mechanical quality factors up to 106. Placing a nanotube next to a coplanar resonator at cryogenic temperatures results in a microwave optomechanical system with dispersive coupling. This system, however, has a fundamentally new property: the nanotube is also a quantum dot, and strong interaction of motion and single electron tunneling dominates its behaviour.
We have implemented a transfer technique to integrate such a nanotube into a superconducting circuit, and present measurements on a combined device coupling a suspended quantum dot to a microwave resonator mode at millikelvin temperatures. The dispersively coupled optomechanical system is characterized via two-tone spectroscopy (red side band photon upconversion) as well as optomechanically induced transparency (OMIT). The interaction of charge transport and vibration, via Coulomb blockade and single electron tunneling, leads to a strongly enhanced, tunable optomechanical coupling.