TY - JOUR
T1 - Giant magnetoresistance and quantum phase transitions in strongly localized magnetic two-dimensional electron gases
AU - Smorchkova, I.
AU - Samarth, N.
AU - Kikkawa, J.
AU - Awschalom, D.
PY - 1998
Y1 - 1998
N2 - The application of a small magnetic field (Formula presented) either parallel or perpendicular to a low-density (Formula presented) magnetic two-dimensional electron gas (2DEG) creates a striking positive magnetoresistance of up to 700%. This is a spin effect, caused by the suppression of spin-dependent hopping paths between localized states with on-site correlation. At higher fields, a spin-related delocalization is observed. In the perpendicular field geometry, orbital effects combine with this delocalization and lead to quantum phase transitions between the spin-polarized insulating state and the (Formula presented) quantum Hall liquid.
AB - The application of a small magnetic field (Formula presented) either parallel or perpendicular to a low-density (Formula presented) magnetic two-dimensional electron gas (2DEG) creates a striking positive magnetoresistance of up to 700%. This is a spin effect, caused by the suppression of spin-dependent hopping paths between localized states with on-site correlation. At higher fields, a spin-related delocalization is observed. In the perpendicular field geometry, orbital effects combine with this delocalization and lead to quantum phase transitions between the spin-polarized insulating state and the (Formula presented) quantum Hall liquid.
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U2 - 10.1103/PhysRevB.58.R4238
DO - 10.1103/PhysRevB.58.R4238
M3 - Article
AN - SCOPUS:0001340735
SN - 1098-0121
VL - 58
SP - R4238-R4241
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 8
ER -