Title
Longitudinal spin transport in diluted magnetic semiconductor superlattices: The effect of the giant Zeeman splitting
Author
Publication type
article
Publication
Lancaster, Pa ,
Subject
Physics
Source (journal)
Physical review : B : condensed matter and materials physics. - Lancaster, Pa, 1998 - 2015
Volume/pages
65(2002) :15 , 8 p.
ISSN
1098-0121
1550-235X
1098-0121
Article Reference
155211
ISI
000175147100072
Carrier
E-only publicatie
Target language
English (eng)
Full text (Publishers DOI)
Abstract
Longitudinal spin transport in diluted magnetic semiconductor superlattices is investigated theoretically. The longitudinal magnetoconductivity (MC) in such systems exhibits an oscillating behavior as function of an external magnetic field. In the weak magnetic-field region the giant Zeeman splitting plays a dominant role that leads to a large negative magnetoconductivity. In the strong magnetic-field region the MC exhibits deep dips with increasing magnetic field. The oscillating behavior is attributed to the interplay between the discrete Landau levels and the Fermi surface. The decrease of the MC at low magnetic field is caused by the s-d exchange interaction between the electron in the conduction band and the magnetic ions. The spin polarization increases rapidly with increasing magnetic field and the longitudinal current becomes spin polarized in strong magnetic field. The effect of spin-disorder scattering on MC is estimated numerically for low magnetic fields and found to be neglectible for our system.
Full text (open access)
https://repository.uantwerpen.be/docman/irua/e0855a/7826.pdf
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