Exciton spin decay modified by strong electron-hole exchange interaction

Details Exciton spin decay modified by strong electron-hole exchange interaction Exciton spin decay modified by strong electron-hole exchange interaction

2006-09-19

arxiv.org/abs/cond-mat/0609471v1

Phys. Rev. Lett. 99, 016601 (2007)

Physics

Condensed Matter

Materials Science

5 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.99.016601

We study exciton spin decay in the regime of strong electron-hole exchange interaction. In this regime the electron spin precession is restricted within a sector formed by the external magnetic field and the effective exchange fields triggered by random spin flips of the hole. Using Hanle effect measurements, we demonstrate that this mechanism dominates our experiments in CdTe/(Cd,Mg)Te quantum wells. The calculations provide a consistent description of the experimental results, which is supported by independent measurements of the parameters entering the model.

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