Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 98: Transport: Nanomechanics

TT 98.7: Vortrag

Donnerstag, 3. April 2014, 17:00–17:15, BEY 81

Microwave Cavity Readout of Graphene NEMS — •Peter Weber, Johannes Guettinger, Ioannis Tsioutsios, and Adrian Bachtold — ICFO-Institut de Ciencies Fotoniques, 08660 Castelldefels (Barcelona), Spain

Graphene is an interesting material for the realization of nanoelectromechanical systems (NEMS), because of its high mechanical strength and its ultra low mass density. In optomechanical sideband cooling experiments [1] the low mass offers the advantage that graphene has a comparatively large motional amplitude in the quantum mechanical ground state. Additionally, mechanical nonlinearities of graphene could still remain significant in the quantum regime. We developed a new method to detect the mechanical vibrations of a graphene resonator by coupling it capacitively to a superconducting microwave cavity. The cavity resonance frequency is modulated by the graphene motion and leads to sideband peaks in the cavity spectrum [2]. In particular, we present fabrication, microwave readout and characterisation of few-layer graphene NEMS at millikelvin temperatures. The fabrication is based on a graphene transfere process on predefined gate structures being part of the superconducting cavity. Our measurements demonstrate, that microwave readout of graphene NEMS is a promising technique enabling the possibility to detect thermal vibrations as well as making cooling experiments feasible with graphene.
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