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Abstracts
O2.8
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.
O2.9
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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