3,580 research outputs found
Angular dependence of magnetoresistance and Fermi-surface shape in quasi-2D metals
The analytical and numerical study of the angular dependence of
magnetoresistance in layered quasi-two-dimensional (Q2D) metals is performed.
The harmonic expansion analytical formulas for the angular dependence of
Fermi-surface cross-section area in external magnetic field are obtained for
various typical crystal symmetries. The simple azimuth-angle dependence of the
Yamaji angles is derived for the elliptic in-plane Fermi surface. These
formulas correct some previous results and allow the simple and effective
interpretation of the magnetic quantum oscillations data in cuprate
high-temperature superconducting materials, in organic metals and other Q2D
metals. The relation between the angular dependence of magnetoresistance and of
Fermi-surface cross-section area is derived. The applicability region of all
results obtained and of some previous widely used analytical results is
investigated using the numerical calculations.Comment: 14 pages, 7 figure
Charged complexes at the surface of liquid helium
Charged clusters in liquid helium in an external electric field form a
two-dimensional system below the helium surface. This 2D system undergoes a
phase transition from a liquid to a Wigner crystal at rather high temperatures.
Contrary to the electron Wigner crystal, the Wigner lattice of charged clusters
can be detected directly.Comment: 6 pages, 1 figur
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