Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2003-12-15
Physics
Condensed Matter
Strongly Correlated Electrons
6 pages, 1 figure
Scientific paper
It is assumed that in a two-dimensional electron system with strong correlation (a Wigner liquid), appearance of some relatively slow-moving objects (clusters) composed of small number of electrons is possible. Such clusters may exist in addition to ordinary mobile carriers of the Fermi type. They can pin to inhomogeneities and play the role of additional scatterers. The clusters composed of two and three electrons are discussed (for near order as in triangular lattice). The number of the clusters depends on temperature and a parallel magnetic field (so accordingly for conductivity and magnetization). In the frame of a simple model, a resistivity increasing and a metal-insulator transition with an increasing of a magnetic field are proved. Near this transition, the resistivity changes with temperature according to a linear law. The model gives a nonlinear dependence of magnetization on a magnetic field.
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