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Phys. Rev. Lett. 102, 247202 (2009) [4 pages]

Origin of Magnetic Circular Dichroism in GaMnAs: Giant Zeeman Splitting versus Spin Dependent Density of States

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M. Berciu1, R. Chakarvorty2, Y. Y. Zhou2, M. T. Alam3, K. Traudt2, R. Jakiela4, A. Barcz4, T. Wojtowicz4, X. Liu2, J. K. Furdyna2, and M. Dobrowolska2,*
1Department of Physics and Astronomy, University of British Columbia, Vancouver, BC, V6T 1Z1, Canada
2Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
3Department of Electrical Engineering, University of Notre Dame, Notre Dame, Indiana 46556, USA
4Institute of Physics, Polish Academy of Sciences, 02-668 Warsaw, Poland

Received 19 January 2009; published 18 June 2009

We present a unified interpretation of experimentally observed magnetic circular dichroism (MCD) in the ferromagnetic semiconductor (Ga,Mn)As, based on theoretical arguments, which demonstrates that MCD in this material arises primarily from a difference in the density of spin-up and spin-down states in the valence band brought about by the presence of the Mn impurity band, rather than being primarily due to the Zeeman splitting of electronic states.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.247202
DOI:
10.1103/PhysRevLett.102.247202
PACS:
75.50.Pp, 75.50.Dd, 75.70.Ak, 78.20.Ls

*mdobrowo@nd.edu

 
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