题目：Dilute Nitride Semiconductors and Its Application in Nanophotonics and Optospintronics
报告人：陈舒拉 教授
湖南大学材料科学与工程学院
湖南省微纳物理与技术重点实验室
时间：2019年4月30日（星期二）下午14:00
地点：国家脉冲强磁场科学中心B206
报告摘要：
Dilute nitride semiconductors, e.g. Ga(In)NAs and GaNP, have been another versatile III-V material system which receives extensive research interest. This is driven by their unique giant bowing effect, i.e. a small incorporation of N into GaAs and GaP enables not only a significant reduction of bandgap, but also decreased lattice constant to integrate with well-established Si-based nanotechnology, therefore holding promise in visible and infrared-ranged nanophotonic applications. I will present our recent results on the GaNAs nanowire lasers, where we for the first time demonstrated the near-IR lasing from such nanostructured dilute nitride materials. Via both alloy and cavity engineering, we achieved wide lasing wavelength tunability and modal switching, which presents GaNAs nanowires as promising candidate for future IR nanolasers. Next, the opto-spintronic properties of GaNAs will be introduced. We demonstrated a room temperature spin-photon interface based on the GaNAs nanopillar array, where a defect-mediated spin filtering mechanism leads to an efficient electron spin amplification by 1200% and achieves a high spin polarization degree up to 60% in single nanopillar at room temperature. These results provide an exciting alternative to realize room temperature nanosized spin laser for future quantum information technology.
报告人简介：
Dr. Chen received his B.Sc. degree in optical science and engineering at Fudan University in 2008, and Ph.D. degree in semiconductor physics at Linkoping University in 2014. From 2014 till 2016, Dr. Chen joined the Electronic Information Device group as a postdoctoral researcher led by Prof. Akihiro Murayama at Hokkaido University, Japan. After that, he returned to Functional Electronic Materials Group at Linkoping University in 2016, first worked as postdoctoral researcher and afterwards was promoted to assistant professor in 2017. In 2018, Dr. Chen joined the School of Material Science and Engineering at Hunan University as professor. So far, Dr Chen has published 28 papers in internationally peer-reviewed journals, including: Nature Communication, Nano Letter, Physical Review B, Physical Review Applied, etc. His current research is focused on the nano-photonics, opto-electronics and opto-spintronics of novel low dimensional semiconductor materials such as TMDC, 2D perovskites and related hybrid van der Waals heterostructures.
