QFS 2016 Book of Abstracts

Abstracts

O2.10 Studying the shape and stability of multielectron bubbles in liquid helium under externally applied electrical fields Vadakkumbatt Vaisakh(1), Joseph Emil M.(2), Maris Humphrey J.(3) and Ghosh Ambarish(1,2) 1) Indian Institute of Science, Department of Physics, Bangalore, India 2) Indian Institute of Science, Centre for Nano Science and Engineering, Bangalore, India 3) Brown University, Department of Physics, Providence RI, USA Multielectron bubbles (MEBs) are charged cavities in liquid helium that provide a rich system to study the behavior of electrons on curved surfaces, and to investigate the properties of two dimensional electron layers at densities that have never been explored. In this talk, I will discuss a new strategy to trap MEBs for several seconds, which is a significant improvement over existing techniques. This has allowed us to study the effect of electric field on the shape and stability of the bubbles. Using time varying electric fields, it has been possible to excite their resonant modes, which suggest a new way of investigating these interesting objects. O2.11 Mobility of Electron Bubbles in Superfluid Helium Salman, H. School of Mathematics, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ, United Kingdom Using a density functional theory that accounts for the properties of surface tension and equation of state in superfluid Helium-4, we model the motion of a self-trapped electron within a cavity. Full 3D simulations are perfrormed to study the complex spatio-temporal dynamics. By studying the motion of the electron subject to an applied electric field of different strengths, the mobility of the electron bubble both within the bulk and for a bubble trapped on a quantised vortex is determined. We discuss our results in light of the recent proposals on the interpretation of measured electron mobilities in liquid Helium. Our results also provide an important tool in understanding the dynamics of electrons trapped on quantised vortices.

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