Subband structure of II-VI modulation-doped magnetic quantum wells

Autor(es)

Henrique J. P. Freire ^[1] ; J. Carlos Egues ^[2]

Afiliação do(s) autor(es)

^[1] Universidade de São Paulo. Instituto de Física de São Carlos. Departamento de Física - Brasil

^[2] Universidade de São Paulo. Instituto de Física de São Carlos. Departamento de Física - Brasil

• Tipo de documento: Artigo Científico
• Fonte: Brazilian Journal of Physics; v. 32, p. 327-330, 2002-06-00.

Resumo

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 ofinteresting spin-dependent phenomena, e.g., spin-resolved transport and many-body effects in polarized two-dimensional electron gases. (AU)

• Processo FAPESP: 99/06868-3 - Spin-dependent physics in Mn-based heterostructures and related topics
• Beneficiário: Henrique Jota de Paula Freire
• Modalidade de apoio: Bolsas no Brasil - Doutorado