Zusammenfassung
We develop a theoretical description of the disordered composite-fermion (CF) metal, which shows that the Drude-like picture of the CF kinetics is only marginally valid at ν=1/2 and becomes totally inadequate at small (|ν−1/2|≪1) deviations from half-filling. We argue that the major effect of disorder is the quasiclassical localization of CFs in a random magnetic field (RMF) and discuss its ...
Zusammenfassung
We develop a theoretical description of the disordered composite-fermion (CF) metal, which shows that the Drude-like picture of the CF kinetics is only marginally valid at ν=1/2 and becomes totally inadequate at small (|ν−1/2|≪1) deviations from half-filling. We argue that the major effect of disorder is the quasiclassical localization of CFs in a random magnetic field (RMF) and discuss its implications for transport measurements. We study the transport properties of fermions in a smoothly varying RMF with mean . We calculate the conductivity at strong disorder and zero , when the transport is governed by percolating `snake states'. We demonstrate that at high the conductivity is due to the exponentially weak non-adiabatic scattering processes. We argue that the classical localization yields a strong enhancement of the magnetooscillations.
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