简介: |
In this talk, I will introduce the basic functions of the low energy electron microscopy (LEEM) setup and discuss applications for semiconductor surface quantum structures formation study based on advanced capacities of LEEM.
Currently, we have procured a state-of-the-art aberration-corrected low energy electron microscopy/photoemission electron microscopy (AC-LEEM/PEEM+ high temperature STM) from SPECS, which has reached the spatial resolution of 1.7 nm. The main feature of this microscope is that it contains 3 prism arrays, as oppose to 2 in their standard configuration, allowing the possibility of adding a second electron gun to the system. Multiply MBE sources and gas sources were designed to facilitate in-situ real-time and real space imaging of technologically important interfaces and quantum structures formation under various conditions and high temperature up to 1200 0C. The high resolution AC-LEEM/PEEM+STM platform will be used to directly visualize and thereby understand some of key details of the semiconductor surface which are often different from those of bulk counterparts and the knowledge will be critical for advanced applications. To that end, we are currently developing an ultrafast spin-polarized electron gun in my lab, together with the necessary lenses, the future electron gun will realize time resolved spin-polarize LEEM (TR-SPLEEM). In this talk, I will discuss the design of this setup and microscope operation. The concept of TR-SPLEEM will be introduced briefly.
个人简介：Prof. Tang received a Ph.D. degree in Condensed Matter Physics in 2003 from Fudan University in China. He subsequently jointed the Max Planck Institute of Microstructure Physics in Germany where his research has involved study spin dynamics by using low energy spin polarized electron. In 2007, he joined Monash University and established the first III-V low energy electron microscopy in the world leading to discoveries. Recently, he joined the Chongqing University in China as full professor focusing on advanced surface dynamics research. He is also developing next generation high resolution ultrafast surface microscopy with spin resolution which can be used for ultrafast surface physics, surface catalysis & chemistry and nano-engineering research. |
