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S. Gladchenko, V. Nikolaenko, Y. Kovdrya, S. Sokolov (2001)
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The transverse magnetoresistive effects in a nondegenerate quasi-one-dimensional (Q1D) electron system over superfluid helium have been investigated experimentally. The longitudinal magnetoresistance ρxx have been measured in magnetic fields B up to 2.5 T in the temperature range 0.48 – 2 K. The width of conducting channels was 90 nm and 35 μm, the mean electron density varied from ∼ 109 m−2 to 1.5 × 1012 m−2. It has been shown that the value of ρxx practically does not depend on B at low B and ρxx ∼ B in the quantum regime. The effective mobility of electrons in narrow channels increases under decreasing temperature and is determined by electron scattering by gas atoms, ripplons, and non-uniformities of the substrate. The mobility of electrons in wide channels increases with decreasing temperature and, below some temperature Tm, decreases. The negative magnetoresistance has been observed in the gas- and ripplon-scattering region. This effect has been explained by weak localization of carriers caused by the interaction of electrons with gas atoms in vapor at high temperatures and with ripplons or with non-uniformities of the substrate at low temperatures.
Journal of Low Temperature Physics – Springer Journals
Published: Feb 8, 2005
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