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Abstracts
I2.4
Electrohydrodynamic effects in superfluid
4
He
Petr Moroshkin
RIKEN Center for Emergent Matter Science, Japan
We inject large quantities of electrically charged impurity particles into superfluid
4
He that can influence the properties and the dynamics of the superfluid.
Applied large static electric field induces the motion of the charged superfluid
and perturbations of the liquid surface that can be captured by a fast video
camera. We observe several electrohydrodynamic phenomena that so far had
not been addressed in relation to superfluid helium: electroconvection, formation
of bubbles, surface waves, quasistatic dimples and humps (Taylor cones), jet
emission (electrospraying), as well as a shuttle motion of charged microparticles
and their trapping at the free surface of the liquid.
I2.5
Electron bubbles and Weyl Fermions in chiral superfluid
3
He-A
Shevtsov Oleksii, Sauls James
Northwestern University, Department of Physics and Astronomy, Evanston, IL
60208 USA
The A phase of
3
He is a chiral superfluid that spontaneously breaks parity and
time-reversal symmetries. This was beautifully demonstrated by the observation of
an anomalous Hall mobility of electron bubbles by the RIKEN group. We present
the theory of the anomalous Hall effect for negative ions in superfluid
3
He-A,
based on a full quantum mechanical treatment of multiple scattering of Bogoliubov
quasiparticles by ions embedded in the chiral superfluid. Quantum interference
leads to the transverse force on the ions. Our results are in quantitative agreement
with the RIKEN experiments, providing a microscopic view of the underlying
processes responsible for the anomalous Hall effect.
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