Angle-Resolved Spectroscopy of Electron-Electron Scattering in a 2D   System
  Electron-beam propagation experiments have been used to determine the energy and angle dependence of electron-electron (ee) scattering a two-dimensional electron gas (2DEG) in a very direct manner by a new spectroscopy method. The experimental results are in good agreement with recent theories and provide direct evidence for the differences between ee-scattering in a 2DEG as compared with 3D systems. Most conspicuous is the increased importance of small-angle scattering in a 2D system, resulting in a reduced (but energy-dependent) broadening of the electron beam. 
A.V. Yanovsky, H. Predel, H. Buhmann, R.N. Gurzhi, A.N. Kalinenko,   A.I. Kopeliovich, and L.W. Molenkamp (Physikalisches In...