Observation of insulating nanoislands in ferromagnetic GaMnAs

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Observation of insulating nanoislands in ferromagnetic GaMnAs

Wang, D. M.; Ren, Y. H.; Jacobs, P. W.; Fahy, Stephen B.; Liu, X.; Furdyna, J. K.; Sapega, V. F.; Merlin, Roberto
Date: 2009
Copyright: © 2009, American Physical Society
Related: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.102.256401
Citation: Wang, D. M., Ren, Y. H., Jacobs, P. W., Fahy, S., Liu, X., Furdyna, J. K., Sapega, V. F. and Merlin, R. (2009) 'Observation of insulating nanoislands in ferromagnetic GaMnAs', Physical Review Letters, 102(25), 256401 (4pp). doi: 10.1103/PhysRevLett.102.256401
Published Version: 10.1103/PhysRevLett.102.256401

Abstract:

Resonant Raman data on ferromagnetic GaMnAs reveal the existence of a new kind of defect: insulating nanoislands consisting of substitutional Mn-Ga acceptors surrounded by interstitial Mn-I donors. As indicated by the observation of a sharp 1S(3/2)-> 2S(3/2) Raman transition at similar to 703 cm(-1), the acceptor-bound holes inside the islands are isolated from the metallic surroundings. Instead, Mn-bound excitons do couple to the ferromagnetic environment, as shown by the presence of associated Raman magnon side bands. This leads to an estimate of 5-10 nm for the nanoisland radius. The islands disappear after annealing due to the removal of the Mn-I ions.

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