【摘要】 通过分析不同温度下HgMnTe磁性二维电子气Shubnikov deHass(SdH)振荡的拍频现象 ,研究了量子阱中电子自旋 轨道相互作用和sp d交换相互作用 .结果表明 :(1 )在零磁场下 ,电子的自旋 轨道相互作用导致电子发生零场自旋分裂 ;(2 )在弱磁场下 ,电子的自旋 轨道相互作用占主导地位 ,并受Landau分裂和Zeeman分裂的影响 ,电子的自旋分裂随磁场增加而减小 ;(3)在高磁场下 ,电子的sp d交换相互作用达到饱和 ,电子的自旋分裂主要表现为Zeeman分裂 .实验证明了当电子的Zeeman分裂能量与零场自旋分裂能量相当时 ,通过SdH振荡对 1 B关系的快速傅里叶变换 (FFT)得到的自旋分裂能量并不等于零场自旋分裂能量更多还原

【Abstract】 Spin orbit interaction and sp d exchange interaction are investigated by analyzing beating patterns of Shubnikov de Hass oscillations in a HgMnTe magnetic two dimensional electron gas (2DEG) at various temperatures. The results show that (1) spin orbit interaction results in zero magnetic field spin splitting in 2DEG; (2) spin orbit interaction is dominant at low magnetic field, and the total spin splitting decreases with increasing magnetic field due to the influence of Landau splitting and Zeeman splitting; (3) at a high magnetic field, the sp d exchange interaction tends to saturate and the spin splitting corresponds to Zeeman splitting. The experiments demonstrate that the spin splitting deduced from fast Fourier transformation (FFT) of SdH oscillations versus. 1/ B is different from zero magnetic field spin splitting when Zeeman spin splitting is comparable to zero magnetic field spin splitting.更多还原