Journal
JOURNAL OF APPLIED PHYSICS
Volume 89, Issue 12, Pages 8017-8021Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1362356
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Amounts of spontaneous spin splittings were estimated from low-temperature magnetoresistances in two-dimensional electron gases created at In0.75Ga0.25As/In0.75Al0.25As heterojunctions under a gate bias. Typical sheet electron densities and mobilities in the raw wafers were similar to1.0 x 10(12)/cm(2) and 2-5 x 10(5) cm(2)/V s at 1.5 K, respectively. A maximum spin-orbit coupling constant alpha (zero) of similar to 30(x10(-12) eV m) was obtained for the van der Pauw sample. In gated Hall-bar samples, a decrease in the alpha (zero) value with decreasing gate voltage (V-g) was first confirmed in a normal heterojunction. The main origin for such a large alpha (zero), which is a few times larger than any previously reported, was found to be a structure-dependent so-called interface contribution in the Rashba term. (C) 2001 American Institute of Physics.
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