中国物理B ›› 2011, Vol. 20 ›› Issue (8): 87503-087503.doi: 10.1088/1674-1056/20/8/087503
• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇 下一篇
谷晓芳, 钱轩, 姬扬, 陈林, 赵建华
Gu Xiao-Fang(谷晓芳), Qian Xuan(钱轩), Ji Yang(姬扬), Chen Lin(陈林), and Zhao Jian-Hua(赵建华)
摘要: Time-resolved Kerr rotation spectroscopy is used to determine the sign of the g factor of carriers in a semiconductor material, with the help of a rotatable magnetic field in the plane of the sample. The spin precession signal of carriers at a fixed time delay is measured as a function of the orientation of the magnetic field with a fixed strength B. The signal has a sine-like form and its phase determines the sign of the g factor of carriers. As a natural extension of previous methods to measure the (time-resolved) photoluminescence or time-resolved Kerr rotation signal as a function of the magnetic field strength with a fixed orientation, such a method gives the correct sign of the g factor of electrons in GaAs. Furthermore, the sign of carriers in a (Ga, Mn)As magnetic semiconductor is also found to be negative.
中图分类号: (Dynamic properties?)