报告人:Prof. Yongmin Kim
工作单位: Department of Applied Physics at Dankook University, Korea.
报告时间:2013年11月19日(周二)下午2:00
报告地点:强磁场中心201会议室
主持人: 田明亮教授
报告题目:Optical Anisotropy and Diamagnetic Energy Shift in InP-GaP effective-mass superlattice
报告摘要:
Linearly polarized photoluminescence measurements in pulsed magnetic fields to ~ 50 T were made from an MBE grown InP-GaP short period superlattice which shows lateral composition modulation.[1] At B=0 T, two distinguished emission peaks emerged which are identified as transitions from In-rich-well and Ga-rich-barrier regions. Both transitions not only are strongly linear polarized parallel to the [110] crystal direction but also show blue- and red-spectral shifts while changing the probe polarizer direction from [110] to [1-10]. In the presence of magnetic field, two peaks exhibit different diamagnetic energy shifts. The difference of the diamagnetic energy shift is due to the formation of effective-mass modulation along the lateral direction within the modulation of the In-rich and Ga-rich regions. Our experimental results agree well with theoretically calculated parameters of InP-GaP effective-mass superlattice.[2] It was only theoretically discussed and our experimental results exhibit experimental realization of the effective-mass superlattice.
金永明博士,韩国Dankook大学应用物理系教授,1996年在美国西北大学获博士学位,1996-2000美国国家强磁场实验室博士后,2008-2009日本筑波材料研究所、2011-2012日本东京大学访问教授。现任韩国物理协会会员、韩国材料研究协会会员、美国物理协会会员
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