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.
@article{arxiv.cond-mat/0609471,
title = {Exciton spin decay modified by strong electron-hole exchange interaction},
author = {G. V. Astakhov and A. V. Koudinov and K. V. Kavokin and I. S. Gagis and Yu. G. Kusrayev and W. Ossau and L. W. Molenkamp and G. Karczewski and T. Wojtowicz and J. Kossut},
journal= {arXiv preprint arXiv:cond-mat/0609471},
year = {2009}
}