Electric and magnetic field manipulation and storage of charge-tunable excitons

The excitonic spectrum of radially polarized semiconductor rings has been analyzed theoretically, in the presence of an in-plane electric field and a perpendicular magnetic field. Based on the numerically exact solution, a regime has been found where the exciton behaves as a single carrier or quasip...

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Veröffentlicht in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2014-02, Vol.89 (7), Article 075304
Hauptverfasser: Simonin, J., Proetto, C. R., Pacheco, M., Barticevic, Z.
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Sprache:eng
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Zusammenfassung:The excitonic spectrum of radially polarized semiconductor rings has been analyzed theoretically, in the presence of an in-plane electric field and a perpendicular magnetic field. Based on the numerically exact solution, a regime has been found where the exciton behaves as a single carrier or quasiparticle, with an effective and tunable electric charge determined by the ring geometry. A protocol is proposed for the storage of excitons without destroying them, consisting in converting them from "bright" to "dark," by performing a sequence of well-defined steps. Accurate analytical approximations are provided for each of the exciton regimens found: quasifree, locked, and broken.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.89.075304