Classical in-plane negative magnetoresistance and quantum positive magnetoresistance in undoped InSb thin films on GaAs (1 0 0) substrates |
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Authors: | Shuichi Ishida Keiki Takeda Atsushi Okamoto Ichiro Shibasaki |
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Institution: | a Department of Electronics and Computer Science, Faculty of Science & Engineering, Tokyo University of Science, Yamaguchi, Daigakudori 1-1-1, Onada, Yamaguchi 756-0884, Japan;b Asahi Chemical Industry Co., Ltd., Samejima 2-1, Fuji, Shizuoka 416-8501, Japan |
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Abstract: | Magnetoresistance (MR) effects have been investigated in perpendicular and parallel magnetic fields at 300, 80 K and liquid He temperatures for undoped InSb thin films 0.1–2.3 μm thick grown on GaAs(1 0 0) substrates by MBE. At high temperatures, the intrinsic carriers show the parabolic negative MR observable only in magnetic fields parallel to the film. The skipping-orbit effect due to surface boundary scattering in the classical orbits in the plane vertical to the film has been argued to be responsible for the negative MR. At low temperatures (T=80 K), the transport is dominated by the two-dimensional (2D) electrons in the accumulation layers at the InSb/GaAs(1 0 0) hetero interface; MR is positive and shows a logarithmic increase with anisotropy between parallel and perpendicular field orientation, arising from the 2D weak anti-localization (WAL) that reflects the interplay between the spin-Zeeman effect and strong spin–orbit interaction caused by the asymmetric potential at the interface (Rashba term). The zero-field spin splitting energy of Δ013 meV, the electron effective mass of m*0.10m0 seven times of the band edge mass in bulk InSb and the effective g-factor of |g*|15 in the accumulation layer have been inferred from fits of MR for the 0.1 μm thick film to the 2D WL theory. |
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Keywords: | InSb ilm on GaAs Negative magnetoresistance InSb/GaAs interface Accumulation layer Weak anti-localization Spin– orbit interaction |
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