Spin polarization and transition from metallic to insulating behavior in 2D systems

Details Spin polarization and transition from metallic to insulating behavior in 2D systems Spin polarization and transition from metallic to insulating behavior in 2D systems

2002-04-11

arxiv.org/abs/cond-mat/0204259v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

3 pages, 3 figures; presented at the MSS10 conference, to be published in Physica E

Scientific paper

We have made quantitative measurements of the spin polarization of two-dimensional (2D) GaAs (100) electrons and GaAs (311)A holes, as a function of an in-plane magnetic field. The functional form of the in-plane magnetoresistance is shown to be intimately related to the spin polarization. Moreover, for three different 2D systems, namely GaAs (100) electrons, GaAs (311)A holes, and AlAs (411)B electrons, the temperature dependence of the in-plane magnetoresistance reveals that their behavior turns from metallic to insulating before they are fully spin polarized.

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