Saved in:
| Main Author: | |
|---|---|
| Format: | Artículo científico |
| Language: | en |
| Published: |
Sociedade Brasileira de Física
2006
|
| Subjects: | |
| Online Access: | https://www.redalyc.org/articulo.oa?id=46436369 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Table of Contents:
- A Selfconsistent Calculation of the Transport Properties of a Double Barrier Spin Filter I. C. da Cunha Lima S. S. Makler C. F. Ritter Física, Astronomía y Matemáticas Tight binding Hamiltonian Transport properties Double barrier spin filter A double barrier resonant tunneling device in which the well is made of a semi-magnetic material can work asan efficient spin filter. Today it is possible to make semiconductors that are ferromagnetic at room temperature.Therefore the device studied here has a great potential to be used as a polarizer, an analyzer and other spintronicapplications. We discuss here the case of a Ga1¡xMnxAs=Ga1¡yAlyAs system because it can be integratedinto the well known AlGaAs=GaAs technology. Our tight-binding Hamiltonian includes the kinetic energy, thedouble-barrier profile, the electric field, the magnetic term, the hole-impurity and the hole-hole interactions.The profile and the charge distribution are calculated self-consistently. In previous works we studied this systemby solving the Hamiltonian in the reciprocal space, in order to simplify the treatment of the Poisson equationfor the charge distribution. Here we introduce a simple one dimensional Green function that permits to solveall terms in the real space. Besides, a real space renormalization formalism is used to calculate exactly theelectronic currents for each spin polarization. The results confirm that the proposed system is a good device forspintronics. 2006 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46436369 en http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.2A Vol.36