ISSN:
1090-6487
Keywords:
73.50.Jt
;
73.40.Hm
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract The mm-wave spectroscopy with high temporal resolution is used to measure the energy relaxation times τe of 2D electrons in GaAs/AlGaAs heterostructures in magnetic fields B=0–4 T under quasi-equilibrium conditions at T=4.2 K. With increasing B, a considerable increase in τe from 0.9 to 25 ns is observed. For high B and low values of the filling factor ν, the energy relaxation rate τ e −1 oscillates. The depth of these oscillations and the positions of maxima depend on the filling factor ν. For ν〉5, the relaxation rate τ e −1 is maximum when the Fermi level lies in the region of the localized states between the Landau levels. For lower values of ν, the relaxation rate is maximum at half-integer values of τ e −1 when the Fermi level is coincident with the Landau level. The characteristic features of the dependence τ e −1 (B) are explained by different contributions of the intralevel and interlevel electron-phonon transitions to the process of the energy relaxation of 2D electrons.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1134/1.568271
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