Experimentally electron-beam injection and detection via quantum point-contacts is used to investigate the scattering of a non-equilibrium electron distribution in a twodimensional electron gas (2DEG) of a GaAs/(Ga,Al)As heterostructure. The energy dependence of electron-electron scattering processes has been studied in a weak magnetic field by investigating the detector signal. Assuming electron beams with a narrow opening angle a magnetic field $B$ perpendicular to the 2DEG plane causes only electrons which are scattered in a point $O$ at an angle $\alpha$ to reach the detector. Thus, it is possible to measure directly the energy dependence of the angular electron distribution after scattering. The experimental data give a clear evidence for the importance of small angle scattering processes in two-dimensional systems, as predicted theoretically.

TY JOUR
TI Spectroscopy of electron - electron scattering in a 2DEG
AU Buhmann, H.
AU Predel, H.
AU Molenkamp, L. V.
AU Gurzhi, R. N.
AU Kalinenko, A. N.
AU Kopeliovich, A. I.
AU Yanovsky, A. V.
PB Успехи физических наук
PY 2001
JO Успехи физических наук
JF Успехи физических наук
JA Усп. физ. наук
VL 171
IS 13
SP 57-61
UR https://ufn.ru/ru/articles/2001/13/k/
ER https://doi.org/10.1070/1063-7869/44/10S/S11