Systematic study of Mn-doping trends in optical properties of (Ga,Mn)As.

Jungwirth, T; Horodyská, P; Tesarová, N; Nemec, P; Subrt, J; Malý, P; Kuzel, P; Kadlec, C; Masek, J; Nemec, I; Orlita, M; Novák, V; Olejník, K; Sobán, Z; Vasek, P; Svoboda, P; Sinova, Jairo

Jungwirth, T; Horodyská, P; Tesarová, N; Nemec, P; Subrt, J; Malý, P; Kuzel, P; Kadlec, C; Masek, J; Nemec, I; Orlita, M; Novák, V; Olejník, K; Sobán, Z; Vasek, P; Svoboda, P; Sinova, Jairo.

Afiliación

Jungwirth T; Institute of Physics ASCR, v.v.i., Cukrovarnicka´ 10, 162 53 Praha 6, Czech Republic.

Phys Rev Lett ; 105(22): 227201, 2010 Nov 26.

Article en En | MEDLINE | ID: mdl-21231417

RESUMEN

We report on a systematic study of optical properties of (Ga,Mn)As epilayers spanning the wide range of accessible Mn(Ga) dopings. The material synthesis was optimized for each nominal Mn doping in order to obtain films which are as close as possible to uniform uncompensated (Ga,Mn)As mixed crystals. We observe a broad maximum in the mid-infrared absorption spectra whose position exhibits a prevailing blueshift for increasing Mn doping. In the visible range, a peak in the magnetic circular dichroism also shifts with increasing Mn doping. The results are consistent with the description of ferromagnetic (Ga,Mn)As based on the microscopic valence band theory. They also imply that opposite trends seen previously in the optical data on a limited number of samples are not generic and cannot serve as an experimental basis for postulating the impurity band model of ferromagnetic (Ga,Mn)As.

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Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2010 Tipo del documento: Article País de afiliación: República Checa Pais de publicación: Estados Unidos

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