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.

PT Journal Article
TI Spectroscopy of electron - electron scattering in a 2DEG
AU Buhmann H
FAU Buhmann H
AU Predel H
FAU Predel H
AU Molenkamp L V
FAU Molenkamp LV
AU Gurzhi R N
FAU Gurzhi RN
AU Kalinenko A N
FAU Kalinenko AN
AU Kopeliovich A I
FAU Kopeliovich AI
AU Yanovsky A V
FAU Yanovsky AV
DP 10 Sup, 2001
TA Usp. Fiz. Nauk
VI 171
IP 13
PG 57-61
RX 10.1070/1063-7869/44/10S/S11
URL https://ufn.ru/ru/articles/2001/13/k/
SO Usp. Fiz. Nauk 2001 Sup 10;171(13):57-61