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Abstracts
O2.3
WAVES ON QUANTUM SURFACES
Todoshchenko Igor, Savin Alexander, Haataja Miika, Hakonen Pertti
Aalto
University,
Department
of
Applied
Physics,
Low Temperature Laboratory, 00076 AALTO, Finland
At an interface between two media, the 3D symmetry is broken which allows for
the existence of exotic particles like Majorana fermions or anyons. A natural way
to explore these surface excitations is to study surface resonances. In addition
to usual capillary waves, helium at low temperatures supports phase waves, like
waves of crystallization. By using a double resonance technique we have obtained
the first evidence of the crystallization waves in
3
He at temperatures well below
0.5 mK. We also discuss the possibility of phase waves at the interface between
two different superfluid phases of
3
He. This wave does not have usual material
mass, and its inertia is due to spin supercurrents.
O2.4
Atomic force microscopy of solid He
Ori Scaly, Almog Danzig, and Emil Polturak,
Technion- Israel Inst. Of Technology, Department of Physics, Haifa 32000, Israel
Crystallites of solid He can move in relation to each other inside the solid. We
detected such motion directly, using an in-situ acoustic sensor [1]. An interesting
question is what physical mechanism would enable such motion. One possibility
is a fluid monolayer at the interface, acting as lubricant. Another possibility is
slip of crystal grains induced by gliding dislocations. To answer this question, we
constructed a new sensor made of 1micron thick conducting wire loop embedded
in the solid. Magnetic flux is applied through the loop. Motion of the wire
induced by moving solid will produce a current which will be detected by a
SQUID amplifier. The S/N of this apparatus should be 100 times higher than
before[1]. We hope to detect the motion of the solid in real time.
1. E. Livne, et al., J. Low Temp. Phys. 180,185 (2015).
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