Relaxation of high-energy quasiparticle distributions: electron-electron scattering in a two-dimensional electron gas
R. N. Gurzhi, A. I. Kopeliovich, A. N. Kalinenko, A. V. Yanovsky, E. N. Bogachek, Uzi Landman, H. Buhmann, L. W. Molenkamp
Abstract
A theory is developed for the evolution of the non-equilibrium distribution of quasiparticles when the scattering rate decreases due to particle collisions. We propose a "modified one-collision approximation" which is most effective for high-energy quasiparticle distributions. This method is used to explain novel measurements of the non-monotonic energy dependence of the signal of scattered electrons in a 2D system. The observed effect is related to a crossover from the ballistic to the hydrodynamic regime of electron flow.
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