SPIN TRANSPORT AND LOCALIZATION IN A MAGNETIC 2-DIMENSIONAL ELECTRON-GAS

Citation
Ip. Smorchkova et al., SPIN TRANSPORT AND LOCALIZATION IN A MAGNETIC 2-DIMENSIONAL ELECTRON-GAS, Physical review letters, 78(18), 1997, pp. 3571-3574
Citations number
23
Categorie Soggetti
Physics
Journal title
ISSN journal
00319007
Volume
78
Issue
18
Year of publication
1997
Pages
3571 - 3574
Database
ISI
SICI code
0031-9007(1997)78:18<3571:STALIA>2.0.ZU;2-9
Abstract
Magnetotransport is investigated in a new class of heterostructures wh erein a two-dimensional electron gas (2DEG) is exchange coupled to a 2 D distribution of local moments. Quantum transport in these ''magnetic '' 2DEGs is strongly influenced by the s-d exchange-enhanced spin spli tting, resulting in a highly spin polarized gas beginning at large Lan dau level filling factors. Diffusive transport in low magnetic fields is dominated by modifications of the Hartree corrections to the conduc tivity arising from the giant spin splitting. An anomalous negative ma gnetoresistance at higher magnetic fields suggests the suppression of spin-disorder scattering.