Physics – Condensed Matter – Materials Science
Scientific paper
2007-08-21
Physica E: Low-dimensional Systems and Nanostructures 40 (2008) 1214-1216
Physics
Condensed Matter
Materials Science
3 pages, 3 figures
Scientific paper
10.1016/j.physe.2007.08.061
Due to the competition between spatial and magnetic confinement, the density of states of a quasi two-dimensional system deviates from the ideal step-like form both quantitatively and qualitatively. We study how this affects the spin-subband populations and the spin-polarization as functions of the temperature, $T$, and the in-plane magnetic field, $B$, for narrow to wide dilute-magnetic-semiconductor quantum wells. We focus on the quantum well width, the magnitude of the spin-spin exchange interaction, and the sheet carrier concentration dependence. We look for ranges where the system is completely spin-polarized. Increasing $T$, the carrier spin-splitting, $U_{o\sigma}$, decreases, while increasing $B$, $U_{o\sigma}$ increases. Moreover, due to the density of states modification, all energetically higher subbands become gradually depopulated.
Galanakis Iosif
Simserides Constantinos
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