Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2001-12-14
Braz. J. Phys. 32, 327 (2002); 33, 166(E) (2003)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
3 pages, 3 postscript figures, submitted to the proceedings of the 10th Brazilian Workshop on Semiconductor Physics (BWSP10)
Scientific paper
Here we investigate the spin-dependent subband structure of newly-developed Mn-based modulation-doped quantum wells. In the presence of an external magnetic field, the s-d exchange coupling between carriers and localized d electrons of the Mn impurities gives rise to large spin splittings resulting in a magnetic-field dependent subband structure. Within the framework of the effective-mass approximation, we self-consistently calculate the subband structure at zero temperature using Density Functional Theory (DFT) with a Local Spin Density Approximation (LSDA). We present results for the magnetic-field dependence of the subband structure of shallow ZnSe/ZnCdMnSe modulation doped quantum wells. Our results show a significant contribution to the self-consistent potential due to the exchange-correlation term. These calculations are the first step in the study of a variety of interesting spin-dependent phenomena, e.g., spin-resolved transport and many-body effects in polarized two-dimensional electron gases.
Egues Carlos J.
Freire Henrique J. P.
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