Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 46: Transport: Nanomechanics (jointly with MM)
TT 46.2: Vortrag
Dienstag, 17. März 2015, 14:15–14:30, A 053
Circuit Electromechanics with a Non-Metallized Nanobeam — •Matthias Pernpeintner1,2,3, T. Faust4, F. Hocke1,2,3, J. P. Kotthaus4, E. M. Weig4,5, R. Gross1,2,3, and H. Huebl1,2 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — 2Nanosystems Initiative Munich, München, Germany — 3Physik-Department, Technische Universität München, Garching, Germany — 4Center for NanoScience (CeNS) and Fakultät für Physik, Ludwig-Maximilians-Universität, München, Germany — 5Department of Physics, University of Konstanz, Konstanz, Germany
In the field of cavity optomechanics, a motional degree of freedom is coupled to an optical cavity. This approach can be transferred to the solid state environment e. g. by combining a superconducting microwave cavity with a nanomechanical resonator.
Whereas typically metallized mechanical resonators are used, we present an alternative approach which is based on the dielectric coupling between a superconducting coplanar waveguide microwave resonator and a non-metallized tensile-stressed silicon nitride nanobeam.
We use the Duffing nonlinearity of the strongly driven beam to calibrate the amplitude spectrum of the mechanical motion and determine the electromechanical vacuum coupling. We find a quality factor of 480,000 at a resonance frequency of 14 MHz and 0.5 K. We deduce a vacuum coupling of 11.5 mHz, which is in quantitative agreement with finite element based model calculations.
This type of hybrid platform will allow further studies on the properties of non-metallized beams and more complex mechanical hybrids.