Paramagnetic ion-doped nanocrystal as a voltage-controlled spin filter - art.no. 206601

Authors
Efros, AL Rashba, EI Rosen, M
Citation
Al. Efros et al., Paramagnetic ion-doped nanocrystal as a voltage-controlled spin filter - art.no. 206601, PHYS REV L, 8720(20), 2001, pp. 6601
Citations number
54
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
8720
Issue
20
Year of publication
2001
Database
ISI
SICI code
0031-9007(20011112)8720:20<6601:PINAAV>2.0.ZU;2-4
Abstract
A theory of spin injection from a ferromagnetic source into a semiconductor through a paramagnetic ion-doped nanocrystal is developed. Spin-polarized current from the source polarizes the ion; the polarized ion, in turn, cont rols the spin polarization of the current flowing through the nanocrystal. Depending on voltage, the ion can either enhance the injection coefficient by several times or suppress it. Large ion spins produce stronger enhanceme nt of spin injection.