We present measurements of electromagnetically induced transparency with an ensemble of donor- bound electrons in low-doped n-GaAs. We used optical transitions from the Zeeman-split electron spin states to a bound trion state in samples with optical densities of 0.3 and 1.0. The electron spin dephasing time T* \approx 2 ns was limited by hyperfine coupling to fluctuating nuclear spins. We also observe signatures of dynamical nuclear polarization, but find these effects to be much weaker than in experiments that use electron spin resonance and related experiments with quantum dots.
@article{arxiv.1007.1010,
title = {Electromagnetically Induced Transparency with an Ensemble of Donor-Bound Electron Spins in a Semiconductor},
author = {Maksym Sladkov and A. U. Chaubal and M. P. Bakker and A. R. Onur and D. Reuter and A. D. Wieck and C. H. van der Wal},
journal= {arXiv preprint arXiv:1007.1010},
year = {2010}
}
Comments
4 pages, 4 figures; Improved analysis of data in Fig. 3, corrected factors of 2 and pi