Chen Ke, Wang Wenfang, Wu Jingda, Schuh D, Wegscheider W, Korn T, Lai Tianshu
State-Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-Sen University, Guangzhou, Guangdong 510275, China.
Opt Express. 2012 Mar 26;20(7):8192-8. doi: 10.1364/OE.20.008192.
A circular dichromatic transient absorption difference spectroscopy of transmission-grating-photomasked transient spin grating is developed and formularized. It is very simple in experimental setup and operation, and has high detection sensitivity. It is applied to measure spin diffusion dynamics and excited electron density dependence of spin ambipolar diffusion coefficient in (110) GaAs quantum wells. It is found that the spin ambipolar diffusion coefficient of (110) and (001) GaAs quantum wells is close to each other, but has an opposite dependence tendency on excited electron density. This spectroscopy is expected to have extensive applicability in the measurement of spin transport.
发展并公式化了一种基于透射光栅光掩膜瞬态自旋光栅的圆二色性瞬态吸收差光谱。其实验装置和操作非常简单，且具有高检测灵敏度。它被用于测量（110）GaAs量子阱中的自旋扩散动力学以及自旋双极扩散系数对激发电子密度的依赖性。研究发现，（110）和（001）GaAs量子阱的自旋双极扩散系数彼此接近，但对激发电子密度的依赖性趋势相反。预计这种光谱在自旋输运测量中具有广泛的适用性。
