Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-11-06
Phys. Rev. B 80, 115337 (2009)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Published in the Physical Review B
Scientific paper
10.1103/PhysRevB.80.115337
The magnetoresistance of a low carrier density, disordered GaAs based two-dimensional (2D) electron gas has been measured in parallel magnetic fields up to 32 T. The feature in the resistance associated with the complete spin polarization of the carriers shifts down by more than 20 T as the electron density is reduced, consistent with recent theories taking into account the enhancement of the electron-electron interactions at low densities. Nevertheless, the magnetic field for complete polarization, Bp, remains 2-3 times smaller than predicted for a disorder free system. We show, in particular by studying the temperature dependance of Bp to probe the effective size of the Fermi sea, that localization plays an important role in determining the spin polarization of a 2D electron gas.
Cavanna Andrea
Gennser Ulf
Mailly Dominique
Maude Duncan K.
Piot B. A.
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