Spin resonance properties of the two-dimensional electron gas

The electron spin resonance (ESR) of two-dimensional electrons (2DE) in Si/ SiGe shows in addition to the absorption signal two types of indirect signa ls: a dispersion signal which reflects the frequency dependence of the elec trical conductivity and a polarization signal which originates from the dep endence of electric conductivity on the spin polarization of the 2DE. The o ccurrence of the polarization signal together with the dependencies of ESR on the direction of external magnetic field and on the electron concentrati on indicate that many body e(-)-e(-) correlation in the high mobility 2DE g as constitutes a specific phase very different from a 2D classical metal. ( C) 2001 Elsevier Science B.V. All rights reserved.