Dresden 2017 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 32: Transport: Nanomechanics and Optomechanics (jointly with CPP, DY, BP, DF)
TT 32.4: Talk
Tuesday, March 21, 2017, 14:45–15:00, HSZ 201
High Quality Factor Mechanical Resonator based on encapsulated NbSe2 Membranes — •Markus Müller1, Marco Will1, Matthew Hamer2, Roman Gorbachev2, Adrian Bachtold3, Christoph Stampfer1, and Johannes Güttinger1 — 1JARA-FIT and 2nd Institute of Physics, RWTH Aachen University, 52074 Aachen — 2School of Physics and Astronomy and Manchester Centre for Mesoscience and Nanotechnology, University of Manchester, Oxford Road, Manchester M13 9PL — 3ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels, Barcelona
Nanomechanical resonators based on 2d materials show high mechanical quality factors and extraordinary force sensitivities. A common problem limiting graphene based resonators are electronical losses due to charge movements induced by mechanical motion or the electrical readout. One promising way to overcome this issue are superconducting 2d membranes potentially suppressing electrical losses. Here we demonstrate a hybrid membrane composed of superconducting three layer thick NbSe2 encapsulated in 1-2 layers of graphene. The resonator is probed by means of capacitive coupling to a superconducting microwave cavity enabling high precision readout of the resonance frequency. We measure a mechanical quality factor of over 200,000 showing the general applicability of such heterostructures in resonators. Additionally, the quality factor is more stable in comparison to graphene only resonators when varying the gate voltage, which can be attributed to a reduced electrical resistance.