Spin transport properties of polygonal quantum ring with Rashba spin-orbit coupling
We propose a model to study the spin transport properties of a regular polygonal quantum ring with two leads, which is subjected to Rashba spin-orbit coupling (SOC). The transmission coefficient has been derived analytically using a standard quantum network method. It is found that in the absence of...
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Veröffentlicht in: | Journal of applied physics 2013-07, Vol.114 (2) |
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Hauptverfasser: | , , |
Format: | Artikel |
Sprache: | eng |
Online-Zugang: | Volltext |
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Zusammenfassung: | We propose a model to study the spin transport properties of a regular polygonal quantum ring with two leads, which is subjected to Rashba spin-orbit coupling (SOC). The transmission coefficient has been derived analytically using a standard quantum network method. It is found that in the absence of Rashba SOC, there are two conditions for which zero conductances arise when the leads are asymmetrically located, and in this case, the transmitted electron is unpolarized. In the presence of SOC, however, one kind of conductance zero can be lifted by the Rashba SOC, while the other persists. We also study the conductance of spin-polarized carriers. It is found that Rashba SOC can be used as an effective mean for inducing spin flip. In addition, based on our calculations, the device considered may demonstrate the properties of a spin filter. |
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ISSN: | 0021-8979 1089-7550 |
DOI: | 10.1063/1.4813231 |