Transition from Weak to Strong Spin-Orbit Scattering Effect on Conductance Fluctuation in InGaAs/InAlAs Quantum Wires
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Conductance fluctuations (CFs) in GaAs/AlGaAs and InGaAs/InAlAs quantum wires were investigated at temperatures ranging from 2 down to 0.06 K. The temperature dependence of the amplitude of CF <δg> did not increase monotonically with decreasing temperature. The temperature dependence of the InGaAs/InAlAs quantum wire followed a one-half reduction of <δg> which was theoretically predicted to appear in the strong spin-orbit scattering limit. We found that the observed temperature dependence correlated well with the transition from weak to strong spin-orbit scattering regimes at very low temperatures. This transition was not as clearly observed in the GaAs/A1GaAs wire as in the InGaAs/InAlAs wire, probably due to the weaker spin-orbit scattering effect.
KeywordsInelastic Scattering Quantum Wire Metal Organic Chemical Vapor Deposition Measured Temperature Range Thermal Diffusion Length
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