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Proceedings Paper

Measurement of spin-flip scattering and photon echo response in GaMnAs
Author(s): Kimberley C. Hall; Daniel Webber; Murat Yildirim; Sam A. March; Reuble Mathew; Angela Gamouras; Margaret Dobrowolska; Xinyu Liu; Jacek K. Furdyna
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Paper Abstract

Four-wave mixing techniques are applied to Ga1-xMnxAs, providing new insight into the fundamental properties of the III-Mn-V semiconductors. Clear signatures of (s,p)-d hybridization associated with the MnGa substitutional impurity are observed in the spectrum of the four-wave mixing signal. Experiments on a ferromagnetic sample show no evidence of hole occupation in the valence band for x = 5%. A photon echo is observed on the interband transition, despite the strong exchange coupling and large defect density in this system. Rapid dephasing associated with Mn-hole spin-flip scattering is observed, with a measured upper bound on the spin-flip scattering time of 40 fs. An excitonic signature tied to many-body effects is observed in LT-GaAs.

Paper Details

Date Published: 26 September 2013
PDF: 10 pages
Proc. SPIE 8813, Spintronics VI, 88132V (26 September 2013); doi: 10.1117/12.2018902
Show Author Affiliations
Kimberley C. Hall, Dalhousie Univ. (Canada)
Daniel Webber, Dalhousie Univ. (Canada)
Murat Yildirim, Dalhousie Univ. (Canada)
Sam A. March, Dalhousie Univ. (Canada)
Reuble Mathew, Dalhousie Univ. (Canada)
Angela Gamouras, Dalhousie Univ. (Canada)
Margaret Dobrowolska, Univ. of Notre Dame (United States)
Xinyu Liu, Univ. of Notre Dame (United States)
Jacek K. Furdyna, Univ. of Notre Dame (United States)

Published in SPIE Proceedings Vol. 8813:
Spintronics VI
Henri-Jean Drouhin; Jean-Eric Wegrowe; Manijeh Razeghi, Editor(s)

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