Griesbeck, Michael and Glazov, Mikhail and Sherman, E. Ya. and Schuh, Dieter and Wegscheider, Werner and Schüller, Christian and Korn, Tobias (2012) Strongly anisotropic spin relaxation revealed by resonant spin amplification in (110) GaAs quantum wells. Physical Review B (PRB) 85 (8), p. 85313.
We have studied spin dephasing in a high-mobility two-dimensional electron system confined in a GaAs/AlGaAs quantum well grown in the  direction, using the resonant spin amplification (RSA) technique. From the characteristic shape of the RSA spectra, we are able to extract the spin dephasing times (SDTs) for electron spins aligned along the growth direction or within the sample plane, as well as the g factor. We observe a strong anisotropy in the spin dephasing times. While the in-plane SDT remains almost constant as the temperature is varied between 4 and 50 K, the out-of-plane SDT shows a dramatic increase at a temperature of about 25 K and reaches values of about 100 ns. The SDTs at 4 K can be further increased by additional, weak above-barrier illumination. The origin of this unexpected behavior is discussed. The SDT enhancement is attributed to the redistribution of charge carriers between the electron gas and remote donors.
|Date:||27 February 2012|
|Institutions:||Physics > Institute of Experimental and Applied Physics > Chair Professor Huber > Group Dominique Bougeard|
Physics > Institute of Experimental and Applied Physics > Retired Professors > Group Werner Wegscheider
Physics > Institute of Experimental and Applied Physics > Chair Professor Lupton > Group Christian Schüller
|Projects:||SFB 689: Spinphänomene in reduzierten Dimensionen|
|Subjects:||500 Science > 530 Physics|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||20 Mar 2012 11:34|
|Last Modified:||13 Mar 2014 18:42|