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Evidence of spontaneous spin polarization in the two-dimensional electron gas | | A.R. Go~ni
; P. Giudici
; F. A. Reboredo
; C. R. Proetto
; C. Thomsen
; K. Eberl
; M. Hauser
; | | Date: |
6 Apr 2004 | | Subject: | Mesoscopic Systems and Quantum Hall Effect | cond-mat.mes-hall | | 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. | | Source: | arXiv, cond-mat/0404145 | | Services: | Forum | Review | PDF | Favorites | |
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