Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2004-05-12
Journal of Applied Physics 96, 4319-4325 (2004)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
18 pages, 4 figures, J. Appl. Phys., accepted for publication
Scientific paper
10.1063/1.1794893
We develop a Monte Carlo model to study injection of spin-polarized electrons through a Schottky barrier from a ferromagnetic metal contact into a non-magnetic low-dimensional semiconductor structure. Both mechanisms of thermionic emission and tunneling injection are included in the model. Due to the barrier shape, the injected electrons are non-thermalized. Spin dynamics in the semiconductor heterostructure is controlled by the Rashba and Dresselhaus spin-orbit interactions and described by a single electron spin density matrix formalism. In addition to the linear term, the third order term in momentum for the Dresselhaus interaction is included. Effect of the Schottky potential on the spin dynamics in a 2 dimensional semiconductor device channel is studied. It is found that the injected current can maintain substantial spin polarization to a length scale in the order of 1 micrometer at room temperature without external magnetic fields.
Cheng Ming-C.
Saikin Semion
Shen Min
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