Coherent optical control of spin-spin interaction in doped semiconductors
Abstract
We provide a theory of laser-induced interaction between spins localized by impurity centers in a semiconductor host. By solving exactly the problem of two localized spins interacting with one itinerant exciton, an analytical expression for the induced spin-spin interaction is given as a function of the spin separation, laser energy, and intensity. We apply the theory to shallow neutral donors (Si) and deep rare-earth magnetic impurities (Yb) in III-V semiconductors. When the photon energy approaches a resonance related to excitons bound to the impurities, the coupling between the localized spins increases, and may change from ferromagnetic to anti-ferromagnetic. This light-controlled spin interaction provides a mechanism for the quantum control of spins in semiconductors for quantum information processing; it suggests the realization of spin systems whose magnetic properties can be controlled by changing the strength and the sign of the spin-spin interaction.
Cite
@article{arxiv.cond-mat/0408216,
title = {Coherent optical control of spin-spin interaction in doped semiconductors},
author = {C. Piermarocchi and G. F. Quinteiro},
journal= {arXiv preprint arXiv:cond-mat/0408216},
year = {2016}
}
Comments
10 pages, 5 figures