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Abstracts
P2.17
POLARON TRANSPORT ANOMALITIES OF SURFACE
ELECTRONS OVER STRUCTURED SUBSTRATE COVERED BY
HELIUM FILM
V. A. Nikolaenko*, A.V. Smorodin, S.S. Sokolov
* B.Verkin Institute for Low Temperature Physics and Engineering of the
National Academy of Sciences of Ukraine, 47 Nauky Ave., Kharkov 61103 ,
Ukraine
The electron polaron can be formed over liquid He in gas phase using surface
electrons (SE). Polaron has a low mobility and this may be used for monitoring
the transition between kinetic and hydrodynamic regime. Polaron is considered
to be a possible candidate for a quantum bit. Autolocalization of SE significantly
depends on the structure and quality of substrate. The polaron formation at
various helium film thicknesses covering the structured silicon substrate with a
regular system of micropores is investigated in temperature range 1.6 – 2.4 K. It
is found that the polaron formation temperature depends on substrate structure.
P2.18
Formation and plasma modes of multi-chain electron system over
liquid helium
S. S. Sokolov, V. E. Syvokon
B. Verkin Institute for Low Temperature Physics and Engineering of the National
Academy of Sciences of Ukraine, 47 Nauki ave., 61103 Kharkov, Ukraine
We simulate the electron system over liquid helium in presence of confinement
potential acting in the plane of electron layer. The transformation of electron
crystal into multi-chain system is observed along with final formation into
zigzag and single-chain configurations. Both longitudinal and transversal plasma
oscillations of formed zigzag electron system are considered theoretically. One of
the longitudinal oscillation modes is acoustic whereas other one is optical. Two
transversal branches of oscillations are optical. We compare the dispersion laws of
plasma modes with those in a single chain of electrons. The results obtained can
be used in experimental efforts to identify the configuration of low-dimensional
electron system over helium in presence of confinement potential.
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