红外与毫米波学报, 2013, 32 (2): 141, 网络出版: 2013-04-18
HgCdTe薄膜的反局域效应
Antilocalization effect in HgCdTe film
摘要
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.
Abstract
The antilocalization effect is observed by magnetotransport measurement at low temperature on a Hg0.77Cd0.23 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.
魏来明, 刘新智, 俞国林, 高矿红, 王奇伟, 林铁, 郭少令, 魏彦峰, 杨建荣, 何力, 戴宁, 褚君浩. HgCdTe薄膜的反局域效应[J]. 红外与毫米波学报, 2013, 32(2): 141. WEI Lai-Ming, LIU Xin-Zhi, YU Guo-Lin, GAO Kuang-Hong, WANG Qi-Wei, LIN Tie, GUO Shao-Ling, WEI Yan-Feng, YANG Jian-Rong, HE Li, DAI Ning, CHU Jun-Hao. Antilocalization effect in HgCdTe film[J]. Journal of Infrared and Millimeter Waves, 2013, 32(2): 141.