Confinement engineering of sd exchange interactions in Ga1xMnxAsAlyGa1yAs quantum wells

N. P. Stern, R. C. Myers, M. Poggio, A. C. Gossard, and D. D. Awschalom
Phys. Rev. B 75, 045329 – Published 19 January 2007

Abstract

Recent measurements of coherent electron spin dynamics reveal an antiferromagnetic sd exchange coupling between conduction-band electrons and electrons localized on Mn2+ impurities in Ga1xMnxAs quantum wells. Here we discuss systematic measurements of the sd exchange interaction in Ga1xMnxAsAlyGa1yAs quantum wells with different confinement potentials using time-resolved Kerr rotation. Extending previous investigations of the dependence of the sd exchange, N0α, 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.

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  • Received 21 April 2006

DOI:https://doi.org/10.1103/PhysRevB.75.045329

©2007 American Physical Society

Authors & Affiliations

N. P. Stern, R. C. Myers, M. Poggio, A. C. Gossard, and D. D. Awschalom

  • Center for Spintronics and Quantum Computation, University of California, Santa Barbara, California 93106, USA

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Issue

Vol. 75, Iss. 4 — 15 January 2007

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