QFS2016 Book of Abstracts

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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