Chern Number Spins of Mn Acceptor Magnets in GaAs

T. O. Strandberg, C. M. Canali, and A. H. MacDonald
Phys. Rev. Lett. 106, 017202 – Published 5 January 2011

Abstract

We determine the effective total spin J of local moments formed from acceptor states bound to Mn ions in GaAs by evaluating their magnetic Chern numbers. When individual Mn atoms are close to the sample surface, the total spin changes from J=1 to J=2, due to quenching of the acceptor orbital moment. For Mn pairs in bulk, the total J depends on pair orientation in the GaAs lattice and on the separation between the Mn atoms. We point out that Berry curvature variation as a function of local moment orientation can profoundly influence the quantum-spin dynamics of these magnetic entities.

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  • Received 21 July 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.017202

© 2011 The American Physical Society

Authors & Affiliations

T. O. Strandberg1, C. M. Canali1, and A. H. MacDonald2

  • 1School of Computer Science, Physics and Mathematics, Linnæus University, 39233 Kalmar-Sweden
  • 2Department of Physics, University of Texas at Austin, Austin, Texas 78712, USA

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Issue

Vol. 106, Iss. 1 — 7 January 2011

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