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Полная версия
ЖУРНАЛЫ // Успехи физических наук // Архив

УФН, 2001, том 171, приложение к № 10, страницы 57–61 (Mi ufn5630)

Quantum dots and wells, mesoscopic networks

Spectroscopy of electron — electron scattering in a 2DEG

H. Buhmanna, H. Predela, L. W. Molenkampa, R. N. Gurzhib, A. N. Kalinenkob, A. I. Kopeliovichb, A. V. Yanovskyb

a Physikalisches Institut, Universität Würzburg, Am Hubland, D-97047 Würzburg, Germany
b B. I. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, Lenin Ave. 47, 31064 Khar'kov, Ukraine

Аннотация: 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

Язык публикации: английский


 Англоязычная версия: Physics–Uspekhi, 2001, 44:10 suppl., s57–s61

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