利用液相外延法制备了Hg0.77Cd0.23Te薄膜样品,在对样品的低温磁输运测试中观察到反局域效应,说明样品中存在较强的自旋-轨道耦合.通过Hikami-Larkin-Nagaoka(HLN)局域模型加上Drude电导模型拟合磁电导曲线,得到了电子的退相干时间和自旋-轨道散射时间.研究结果表明,电子的退相规律符合Nyquist退相机制.
The antilocalization effect is observed by magnetotransport measurement at low temperature on a Hgo.77 Cd0.23 Te sample prepared by liquid epitaxy technique, which suggests a strong spin-orbit interaction within this system. The phase coherence time and spin-orbit scattering time of electrons are extracted by fitting the experiment data with the Hikami-Larkin-Nagaoka (HLN) theory plus the Drude conductance model. According to the temperature dependence of phase coherence time, we also find that the Nyquist mechanism dominates the dephasing process.