【作者】 赖天树； 刘鲁宁； 寿倩； 雷亮； 邓莉； 徐耕； 李熙莹； 林位株；

【Author】 : LAI Tianshu, LIU Luning, SHOU Qian, LEI Liang, DENG Li, XU Geng, LI Xiying, LIN Weizhu State-key Laboratory of Optoelectronic Materials and Technologies, Department of Physics Sun Yat-Sen University, Guangzhou 510275

【机构】 中山大学光电材料与技术国家重点实验室物理系；

【摘要】 发展了椭圆偏振泵浦-探测光谱。基于二能级体系的速率方程,获得了椭圆偏振光泵浦注入非完全自旋极化初始条件下的自旋向上和向下载流子布居的解析解。基于小信号近似,给出了左、右旋椭圆偏振探测光的透射光强变化的表达式。与目前的圆偏振泵浦-探测光谱相比,椭圆偏振泵浦-探测光谱能够极大地降低实验难度及波片的相位延迟精度。应用椭圆偏振泵浦-探测光谱于GaAs/AlGaAs多量子阱结构中电子的自旋偏振弛豫研究,获得了与圆偏振泵浦-探测光谱实验结果一致的结果,表明了椭圆偏振泵浦-探测光谱的可行、可靠性。更多还原

【Abstract】 An elliptically-polarized pump-probe spectroscopy is developed. Based on the rate equations of two-level system, the solutions of spin-up and spin-down carrier populations are obtained under the condition of incompletely initial spin polarization photoinduced by elliptically polarized pump light. The expressions of transmitted intensity change of right-hand and left-hand elliptically-polarized probe beam are given based on the approximation of small signal. In comparison with present circularly-polarized pump-probe spectroscopy, the developed spectroscopy is implemented easily in experiments and doesn’t need the waveplates with high accuracy of phase retardation. The spin- polarized relaxation of electrons in GaAs/AlGaAs quantum wells is studied by using the developed spectroscopy. The results are in agreement with those obtained by circularly-polarized pump-probe spectroscopy. It is shown that the developed spectroscopy is feasible and reliable.更多还原