Abstract
In the presence of strong random scattering the behavior of particles with degenerate spectra is quite different from Anderson localization of particles in a single band: it creates geometric states rather than confining the particles to an area of the size of the localization length. These states are subject to a Fokker-Planck dynamics with universal drift velocity and disorder dependent diffusion coefficient. This behavior has some similarity with the unidirectionally propagating edge states in quantum Hall systems.
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