Evidence of spontaneous spin polarization in the two-dimensional electron gas
Abstract
Density-functional calculations using an exact exchange potential for a two-dimensional electron gas (2DEG) formed in a GaAs single quantum well predict the existence of a spin-polarized phase, when an excited subband becomes slightly populated. Direct experimental evidence is obtained from low temperature and low excitation-power photoluminescence (PL) spectra which display the sudden appearance of a sharp emission peak below the energy of the optical transition from the first excited electron subband upon its occupation. The behavior of this PL feature in magnetic fields applied in-plane as well as perpendicular to the 2DEG indicate the formation of spin-polarized domains in the excited subband with in-plane magnetization. For it speaks also the strong enhancement of exchange-vertex corrections observed in inelastic light scattering spectra by spin-density excitations of a slightly occupied first-excited subband.
Keywords
Cite
@article{arxiv.cond-mat/0404145,
title = {Evidence of spontaneous spin polarization in the two-dimensional electron gas},
author = {A. R. Goñi and P. Giudici and F. A. Reboredo and C. R. Proetto and C. Thomsen and K. Eberl and M. Hauser},
journal= {arXiv preprint arXiv:cond-mat/0404145},
year = {2009}
}
Comments
one tex file and four figures