Regensburg 2019 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 42: Nano- and Optomechanics

TT 42.2: Talk

Wednesday, April 3, 2019, 11:00–11:15, H7

Optomechanics of a suspended carbon nanotube quantum dot coupled to a coplanar microwave resonator, part 2: experiment — •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. 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 carbon nanotube quantum dot to a coplanar microwave resonator mode at millikelvin temperatures.

Nanotube vibration and microwave cavity form a dispersively coupled optomechanical system, which we characterize 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.