Abstract

A p-type inversion layer adjacent to a grain boundary in medium angle tilt germanium bicrystals behaves like a two-dimensional disordered system. Superimposed on a random potential is a periodic one , generated by a lattice of edge dislocations. At helium temperatures both resistivity and Hall coefficient increase logarithmically with decreasing temperature. The transverse magneto-resistance shows a logarithmic B dependence in wide ranges of the magnetic field. Many of the experimental data can be explained qualitatively in terms of recently developed many-body theories.

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