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Electron spin polarization through interactions between excitons, trions, and the two-dimensional electron gas

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2007

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Chen, Zhigang
Carter, Sam G.
Cundiff, Steven T.
Yakovlev, Dmitri R.
Karczewski, Grzegorz
Wojtowicz, Tomasz
Kossut, Jacek

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http://nbn-resolving.de/urn:nbn:de:bsz:352-174984
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https://doi.org/10.1103/PhysRevB.75.115320
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Physical Review B. 2007, 75(11). ISSN 1098-0121. Available under: doi: 10.1103/PhysRevB.75.115320

Zusammenfassung

We use a two-color transient Kerr rotation technique to study the spin dynamics in an n-doped CdTe∕Cd0.85Mg0.15Te quantum well. The dynamics displays the interplay between excitons, trions, and the two-dimensional electron gas. The spin relaxation of individual species is resolved by spectral selection. The spin dynamics are quantitatively described by rate equations involving the spin populations of excitons, trions, and the electron gas. Under resonant excitation of excitons, spin polarization of the electron gas is generated through trion formation, with the spin coherence partially lost through exciton spin relaxation. A maximum hole spin-flip time is observed around the trion resonance, with a rapid decrease for increasing excitation energy.

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ISO 690CHEN, Zhigang, Rudolf BRATSCHITSCH, Sam G. CARTER, Steven T. CUNDIFF, Dmitri R. YAKOVLEV, Grzegorz KARCZEWSKI, Tomasz WOJTOWICZ, Jacek KOSSUT, 2007. Electron spin polarization through interactions between excitons, trions, and the two-dimensional electron gas. In: Physical Review B. 2007, 75(11). ISSN 1098-0121. Available under: doi: 10.1103/PhysRevB.75.115320
BibTex
@article{Chen2007Elect-17498,
  year={2007},
  doi={10.1103/PhysRevB.75.115320},
  title={Electron spin polarization through interactions between excitons, trions, and the two-dimensional electron gas},
  number={11},
  volume={75},
  issn={1098-0121},
  journal={Physical Review B},
  author={Chen, Zhigang and Bratschitsch, Rudolf and Carter, Sam G. and Cundiff, Steven T. and Yakovlev, Dmitri R. and Karczewski, Grzegorz and Wojtowicz, Tomasz and Kossut, Jacek}
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