QUASI-CLASSICAL APPROACH TO IMPURITY EFFECT ON MAGNETOOSCILLATIONS IN2D METALS

We develop a quasiclassical method based on the path integral formalis m, to study the influence of disorder on magnetooscillations of the de nsity of states and conductivity. The treatment is appropriate for ele ctron systems in the presence of a random potential with large correla tion length or a random magnetic field, which are characteristic featu res of various 2D electronic systems presently studied in experiment. In particular, we study the system of composite fermions in the fracti onal quantum Hall effect device, which are coupled to the Chern-Simons field and subject to a long-range random potential.