Nanomechanical vibrating wire resonator for phonon spectroscopy in Helium

Abstract

We demonstrate how to build a vibrating wire resonator for phonon excitation in liquid helium. The resonator is designed as a nanoscopic mechanically flexible beam machined out of a semiconductor/metal-hybrid. Quenching of the mechanical resonance around 100 MHz by phonon excitation in liquid 4He at 4.2 K is shown. First measurements operating the nano-resonator in a dilution of 3He/4He at 30 mK are presented.

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