INTERACTION RULED TEMPERATURE-DEPENDENCE OF THE ELECTRON-CYCLOTRON MASS IN GAAS HETEROJUNCTIONS

Cyclotron resonance of inversion layer electrons in GaAs was studied f rom liquid helium temperatures up to 110 K for densities smaller than 10(11) cm(-2). A continuous red shift of the resonance position was ob served with increasing temperature. A quantitative analysis of the exp eriment demonstrates that electron-electron interactions which introdu ce a coupling of the electrical dipole transitions between the Landau levels are responsible for this shift. (C) 1998 Elsevier Science B.V. All rights reserved.