Abstract
Recent measurements of coherent electron spin dynamics reveal an antiferromagnetic exchange coupling between conduction-band electrons and electrons localized on impurities in quantum wells. Here we discuss systematic measurements of the exchange interaction in quantum wells with different confinement potentials using time-resolved Kerr rotation. Extending previous investigations of the dependence of the exchange, , on well width, we find that its magnitude also depends on well depth. Both phenomena reduce to a general dependence on confinement energy, described by a band-mixing model of confinement-induced kinetic exchange in the conduction band.
- Received 21 April 2006
DOI:https://doi.org/10.1103/PhysRevB.75.045329
©2007 American Physical Society