Symmetry and spin dephasing in (110)-grown quantum wells.

Bel'kov, V V; Olbrich, P; Tarasenko, S A; Schuh, D; Wegscheider, W; Korn, T; Schüller, C; Weiss, D; Prettl, W; Ganichev, S D

Bel'kov, V V; Olbrich, P; Tarasenko, S A; Schuh, D; Wegscheider, W; Korn, T; Schüller, C; Weiss, D; Prettl, W; Ganichev, S D.

Afiliación

Bel'kov VV; Terahertz Center, University of Regensburg, 93040 Regensburg, Germany.

Phys Rev Lett ; 100(17): 176806, 2008 May 02.

Article en En | MEDLINE | ID: mdl-18518322

RESUMEN

Symmetry and spin dephasing in (110)-grown GaAs quantum wells (QWs) are investigated applying magnetic field induced photogalvanic effect and time-resolved Kerr rotation. We show that magnetic field induced photogalvanic effect provides a tool to probe the symmetry of (110)-grown quantum wells. The photocurrent is only observed for asymmetric structures but vanishes for symmetric QWs. Applying Kerr rotation we prove that in the latter case the spin relaxation time is maximal; therefore, these structures set the upper limit of spin dephasing in GaAs QWs. We also demonstrate that structure inversion asymmetry can be controllably tuned to zero by variation of delta-doping layer positions.

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Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2008 Tipo del documento: Article País de afiliación: Alemania Pais de publicación: Estados Unidos

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