Synchronous Spatial Oscillation of Electron- and Mn-Spin Polarization in Dilute-Magnetic-Semiconductor Quantum Wells under Spin-Orbit Effective Magnetic Fields

Details Synchronous Spatial Oscillation of Electron- and Mn-Spin Polarization in Dilute-Magnetic-Semiconductor Quantum Wells under Spin-Orbit Effective Magnetic Fields Synchronous Spatial Oscillation of Electron- and Mn-Spin Polarization in Dilute-Magnetic-Semiconductor Quantum Wells under Spin-Orbit Effective Magnetic Fields

2011-06-16

arxiv.org/abs/1106.3124v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

17 pages, 4 figures, 1 table

Scientific paper

In semiconductors, spin-orbit effective magnetic fields are used to control electron-spin polarization. This operation, however, destroys the electron-spin coherence, and the spin polarization is limited at the vicinity of a ferromagnetic source electrode. In this paper, we propose to use dilute magnetic semiconductors to improve coherence of spatially oscillating electron-spin polarization. In dilute magnetic semiconductors, the electron-spin polarization near the source electrode dynamically induces local spin polarization of magnetic impurities through the s-d spin-flip scattering. This impurity polarization improves, in turn, the electron-spin coherence, and the improved electron-spin polarization induces impurity-spin polarization farther in the adjacent region. Because of this positive feedback, coherent and synchronized spatial oscillation of the electron- and impurity-spin polarization grows cooperatively. A numerical calculation for a CdMnTe quantum well demonstrates the validity of this mechanism.

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