Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2003-09-15
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
14 pages, 14 figures
Scientific paper
10.1103/PhysRevB.69.115339
A theory of the proximity effects of the exchange splitting in a ferromagnetic metal on a two dimensional electron gas (2DEG) in a semiconductor is presented. The resulting spin-dependent energy and lifetime in the 2DEG create a marked spin-splitting in the driven in-plane current. The theory of the planar transport allows for current leakage into the ferromagnetic layer through the interface, which leads to a competition between drift and diffusion. The spin-dependent in-plane conductivity of the 2DEG may be exploited to provide a new paradigm for spintronics devices based on planar devices in a field-effect transistor configuration. An illustrative example is provided through the transport theory of a proposed spin-valve which consists of a field-effect transistor configuration with two ferromagnetic gates. Results are provided for two experimentally accessible systems: the silicon inversion layer and the naturally-formed InAs accumulation layer.
Ciuti Cristiano
McGuire James P. Jr.
Sham L. J.
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