电子自旋极化对CdTe/CdMgTe量子阱中核自旋动力学的影响及探测
Nuclear spin dynamics influenced and detected by electron spin polarization in CdTe/CdMgTe quantum wells
摘要：
利用光探测核磁共振研究了n掺杂CdTe/（Cd，Mg）Te量子阱结构中各组分同位素的核自旋相干性和弛豫动力学。利用时间分辨的抽运-探测法拉第椭圆率，我们产生并探测了驻留电子的相干自旋动力学。光生电子自旋极化被转移到核自旋系统中，核自旋系统被极化并作为奥弗豪泽场作用于电子自旋。在共振射频脉冲的影响下，我们追踪了核同位素$^{111}$ Cd、$^{113}$ Cd和$^{125}$ Te的相干自旋动力学。我们测量了原子核的拉比振荡、非均匀退相时间$T_2^*$、自旋相干时间$T_2$和纵向弛豫时间$T_1$。此外，我们研究了激光激发和相应的电子自旋极化对核自旋弛豫时间的影响，并发现与电子自旋的相互作用引起的这一时间的弱延长。
英文摘要：
Nuclear spin coherence and relaxation dynamics of all constituent isotopes of an n-doped CdTe/(Cd,Mg)Te quantum well structure are studied employing optically detected nuclear magnetic resonance. Using time-resolved pump-probe Faraday ellipticity, we generate and detect the coherent spin dynamics of the resident electrons. The photogenerated electron spin polarization is transferred into the nuclear spin system, which becomes polarized and acts back on the electron spins as the Overhauser field. Under the influence of resonant radio frequency pulses, we trace the coherent spin dynamics of the nuclear isotopes $^{111}$Cd, $^{113}$Cd, and $^{125}$Te. We measure nuclear Rabi oscillations, the inhomogeneous dephasing time $T_2^*$, the spin coherence time $T_2$, and the longitudinal relaxation time $T_1$. Furthermore, we investigate the influence of the laser excitation and the corresponding electron spin polarization on the nuclear spin relaxation time and find a weak extension of this time induced by interaction with the electron spins.
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