Regensburg 2007 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 23: Spin controlled transport II
HL 23.6: Talk
Tuesday, March 27, 2007, 15:15–15:30, H14
Spin-orbit coupling in InGaSb-based two-dimensional electron gas — •Vitaliy Guzenko1, Masashi Akabori2, Thomas Schäpers1, Sergio Cabañas1, Taku Sato2, Toshi-kazu Suzuki2, and Syoji Yamada2 — 1Institute of Bio- and Nanosystems (IBN 1), Reserach Centre Jülich, 52425 Jülich, Germany — 2Center for Nano-Materials and Technology (CNMT), Japan Advanced Institute of Science and Technology (JAIST), 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan
Two-dimensional electron gases (2DEG) formed in high-mobility InGaSb-based heterostructures with high indium content are promising candidates for spintronic applications because of their strong spin-orbit coupling and large g-factor. To investigate these properties magnetoconductance measurements around zero magnetic field (localization measurements) as well as in strong magnetic fields (coincidence method) were performed. A pronounced enhancement of magnetoconductance at B=0 T due to the weak antilocalization effect was observed, which is an unambiguous indication of the spin-orbit coupling in these samples. Experimental curves measured as a function of temperature could be fitted by a theoretical model [1], and a quantitative estimation of the characteristic scattering times was done. By the coincidence method g-factor as large as 31 could be determined. By applying an additional constant magnetic field in the plane of 2DEG a strong suppression of the weak antilocalization peak was achieved. This is a qualitative confirmation of the result of the coincidence measurements. [1] M.M.Glazov and L.E.Golub, Semicond. 40 (2006) 1209.