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  • 1
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The spectrum of new modes of edge magnetoplasmons (EMP) in an electron layer over liquid helium was studied. The experiments were carried out in the temperature range 0.5–0.7 K at frequencies 0.87–1 MHz and electron density (1.5–3.5) ⋅ 1012 m−2 in a magnetic field up to 0.5 T. Besides conventional edge magnetoplasmons and the EMP mode connected with the displacement of the electron sheet boundary, a new “ acoustic” edge magnetoplasmon mode was observed in an electron layer over liquid helium for the first time. Spectrum of all three types of the magnetoplasmon modes are compared with the existing theories.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: We measured the velocity of electrons moving in helium vapor along the liquid-vapor interface in electric fields which were weak in the direction parallel to the surface and strong in the direction perpendicular to the surface. It is shown that in the 1.4–2.0 K range in applying retarding fields up to 8000 V/cm, when the electron density is sufficiently large, there is evidence for the existence of slower electrons as compared to those whose mobility is controlled by collisions with He atoms in the vapor phase. The mobility of these slower electrons is relatively temperature independent and decreases with growing electron density and retarding electric field.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: The magnetoconductivity Σ xx of surface electrons over liquid helium at electron densities (1–9) × 108 cm−2 is measured at temperatures down to 0.5 K and magnetic fields H up to 25 kOe. Σ xx is shown to decrease with increasing H. For rather high temperatures and low magnetic fields dependence Σ xx −1 on H displays a classical behavior, but as the temperature is reduced or H is increased, a transition to the quantum magnetotransport regime occurs. It is shown that Σ xx decreases at lowering temperature, passes through a minimum and then slightly increases in the region of electron-ripplon scattering. The measured data are in good agreement with the theoretical results taking into account the preferable contribution of electron scattering on ripplons with wavelength near magnetic length. At the region of electron crystal Σ xx is weakly dependent on T. At low magnetic field Σ xx −1 increases with H linearly and, at H〉17kOe, Σ xx −1 ~ H 1.5.
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  • 4
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The spectrum of new modes of edge magnetoplasmons (EMP) in an electron layer over liquid helium was studied. The experiments were carried out in the temperature range 0.5–0.7 K at frequencies 0.87–1 MHz and electron density (1.5–3.5)·1012m−2 in a magnetic field up to 0.5 T. Besides conventional edge magnetoplasmons and the EMP mode connected with the displacement of the electron sheet boundary, a new “acoustic” edge magnetoplasmon mode was observed in an electron layer over liquid helium for the first time. Spectrum of all three types of the magnetoplasmon modes are compared with the existing theories.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The properties of a quasi-one-dimensional (Q1D) electron system on liquid helium are considered and the experiments on the carrier transport are presented. It has been shown that the electron mobility μ changes from high values close to that for bulk helium to very small values as a function of the Q1D channel width. Such a behaviour of μ is connected to a gradual transition from the regime of the quasi-free movement of the carriers in a Q1D system to the conditions of strong localization of the electrons. In the last case μ depends on temperature exponentially with the activation energy of a few degrees. It is predicted that in Q1D channels in regime of the localization two optical plasmon branches can exist. One of them (a high frequency branch) is connected with the oscillations of electrons in potential wells and another one has lower frequency and is due to the oscillations of dimples, which are created by localized electrons on the liquid helium surface, in the potential wells. Possible new experiments on study of magnetotransport, plasma oscillations and ”phase diagram” of ordered-disordered states in a Q1D electron system of a finite length over liquid helium are proposed and discussed.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The mobility μ and lifetime of ground-level electrons τ⊥ are studied experimentally in a two-dimensional electron system at the surface of liquid helium at temperatures of0.4 to1.4 K and charge concentrations of (2.8–12.0) × 108 cm−2. It is shown that for fairly low temperature and high concentration where the frequency of interelectronic collisions is much higher than that of electron-ripplon ones, the so-called complete control condition is realized in the electron system, i.e., when the average drift velocity of electrons and the effective electron temperature can be introduced. This model is found to describe well the kinetic properties of surface electrons in the range of charge concentrations up to 4×108 cm−2, where the one-particle approach is no longer applicable. For the value of parameter Γ=e2(πns)1/2/T=47 that corresponds to a strong electron-electron interaction, the lifetime τ⊥ is found to increase sharply and the short-range order typical of a liquid state appears in the two-dimensional electron layer.
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  • 7
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The unique system - linear electron chains on the liquid helium surface was realized experimentally for the first time. The system was realized using curvature of the liquid helium surface film covering a profiled substrate with a small dielectric constant and a pressing electric field holding electrons in the liquid channels. The conductivity of carriers in linear electron chains and magnetoresistance of a quasi-one-dimensional system have been measured in the temperature range 0.5 - 1.8 K in holding electric fields up to 1 kV/cm. The transport properties of the system depend on the substrate cleanness. For a clean system the electron mobility increases with decreasing temperature, the data are in good agreement with the existing theory which describes transport properties in a one-dimensional electron system without localization. Charging of substrate leads to the localization process in electron chains. It has been shown that in the absence of localization magnetoresistance of a quasi-one-dimensional system on liquid helium in the region of ripplon scattering increases with increasing magnetic field.
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