H. Buhmann^a, H. Predel^a, L.V. Molenkamp^a, R.N. Gurzhi^b, A.N. Kalinenko^b, A.I. Kopeliovich^b, A.V. Yanovsky^b
^aJulius-Maximilians-Universität Würzburg, Sanderring, 2 Würzburg, 97070, Germany , Würzburg , Germany
^bB.Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, prosp. Lenina 47, Kharkov, 61103, Ukraine

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.

PACS: 73.63.−b, 73.21.−b, 68.65.−k, 71.35.−y (all)
DOI: 10.1070/1063-7869/44/10S/S11
URL: https://ufn.ru/en/articles/2001/13/k/
Citation: Buhmann H, Predel H, Molenkamp L V, Gurzhi R N, Kalinenko A N, Kopeliovich A I, Yanovsky A V "Spectroscopy of electron - electron scattering in a 2DEG" Phys. Usp. 44 57–61 (2001)

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Оригинал: Buhmann H, Predel H, Molenkamp L V, Gurzhi R N, Kalinenko A N, Kopeliovich A I, Yanovsky A V «Spectroscopy of electron - electron scattering in a 2DEG» УФН 171 57–61 (2001); DOI: 10.1070/1063-7869/44/10S/S11