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Hokkaido University Collection of Scholarly and Academic Papers >
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Synchronous Spatial Oscillation of Electron- and Mn-Spin Polarizations in Dilute-Magnetic-Semiconductor Quantum Wells under Spin–Orbit Effective Magnetic Fields
| Title: | Synchronous Spatial Oscillation of Electron- and Mn-Spin Polarizations in Dilute-Magnetic-Semiconductor Quantum Wells under Spin–Orbit Effective Magnetic Fields |
| Authors: | Tsuchiya, Takuma Browse this author →KAKEN DB |
| Keywords: | Rashba field | | electron-spin precession | | electron-spin polarization | | dilute magnetic semiconductors | | s-d interaction | | CdMnTe | | impurity Overhauser effect | | Mn-spin polarization | | quantum wells | | Monte Carlo method |
| Issue Date: | Sep-2012 |
| Publisher: | 日本物理学会 |
| Journal Title: | Journal of the Physical Society of Japan |
| Volume: | 81 |
| Issue: | 9 |
| Start Page: | 094706 |
| Publisher DOI: | 10.1143/JPSJ.81.094706 |
| Abstract: | In semiconductors, spin-orbit effective magnetic fields, i.e., the Rashba and Dresselhaus fields, are used to control electron-spin polarization. This operation, however, destroys the electron-spin coherence, and the spin polarization is limited to the vicinity of a ferromagnetic source electrode. In this paper, we propose the use of dilute magnetic semiconductors to improve the coherence of spatially oscillating electron-spin polarization. In dilute magnetic semiconductors, the electron-spin polarization near the source electrode dynamically induces the local spin polarization of magnetic impurities through s-d spin-flip scattering. This impurity-spin polarization improves, in turn, the coherence of the electron-spin polarization, and this improved electron-spin polarization induces impurity-spin polarization farther in the adjacent region. Because of this positive feedback, the coherent and synchronized spatial oscillations of electron- and impurity-spin polarizations grow cooperatively. A numerical calculation for a CdMnTe quantum well demonstrates the validity of this mechanism. |
| Rights: | © 2012 The Physical Society of Japan |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/50200 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 土家 琢磨
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