Depellette, Joe and Hayward, Callum and Guthrie, Andrew and Kafanov, Sergey and Morrison, Nathaniel and Noble, Mark and Pashkin, Yuri and Pickett, George and Tsepelin, Viktor (2019) Non-linear Dynamics of the Trapped Quantum Vortex. APS March Meeting 2021.
Full text not available from this repository.Abstract
Nanomechanical resonators have recently been studied as high-sensitivity probes of fluid dynamics in superfluid helium. When turbulence is introduced to such a system, quantum vortices may form and become trapped by the resonator, either completely surrounding the oscillating beam (a fully trapped vortex) or surrounding only part of it (a partially trapped vortex). Fully trapped vortices have been studied using the model of a linear harmonic oscillator behaviour with great success. However, in the presence of a partially trapped vortex, the oscillators have been found to behave non-linearly. We analysed the non-linear response of a doubly clamped nanobeam resonator submerged in helium-4 at 10 mK in the presence of a partially trapped vortex. Our analysis demonstrates that the observed non-linearities are caused by the dynamics of the vortex line. N. M. acknowledges the financial support of the US-UK Fulbright Program.