Cd1—xMnxTe的巨大法拉第旋转效应

测量了半磁半导体Cd_(1x)Mn_xTe单晶的巨大法拉第旋转效应,并研究了Cd_(1-x)Mn_xTe法拉第旋转随组分x及温度的变化规律。局域的Mn~(2+)离子与导带类s电子及价带类P电子之间的自旋—自旋相互作用引起了Cd_(1-x)Mn_xTe中反常大的塞曼分裂,从而导致巨大法拉第效应的产生。激子跃迁在半磁半导体法拉第效应中起主导作用。

Giant Faraday Rotation in Semimagnetic Semiconductor Cd_1-xMnxTe

Wide-gap semimagnetic semiconductors, such as Cd1-xMnxTe, exhibit a giant Fara-day rotation, which is a consequence of the Mn2+-band electron exchange interaction. The exchange interaction between the d electrons of Mn2+ and the s-like conduction-band electrons as well as the p-like valence-band electrons causes the large Zeeman splitting of the excitonic band in a wide-gap SMSC, which leads to the strong enhancement of Faraday rotation. For SMSC alloys, the excitonic transitions appear to play a dominant role in determining the Faraday effect.Measurements of the giant Faraday rotation as a function of Mn2+ concentration (x) and temperature in Cd1-xMnxTe have been carried out. The details of experiments and results are given.