Time: October 19th, 2016, AM 9:00
Location: Conference Room at the 1st floor, No. 1 Energy Building
Wensheng Yan (National Synchrotron Radiation Laboratory, University of Science and Technology of China)
Abstract：Low diluted magnetic semiconductors (DMSs), which possess the magnetic and semiconducting characteristics of materials, are promising candidates for developing the next-generation spintronics devices to use simultaneously the spin and charge characters of electrons. Electronically understanding the microscopic mechanism of mediating the magnetism of the DMS materials is of crucial importance to fabricate spintronics devices controllably through external fields like light and electric fields. The lecturer used X-ay absorption spectroscopy combining first-principles calculations explored the local atomic and electronic structures of numerous low-dimensional semiconductors, revealed the interplay of the dimension, structure and magnetism of magnetic semiconductors, illustrated the influence of the surface structure distortion on the bandgap structure of the semiconductors, and proposed a series of novel methods for tuning the magnetism of low-dimensional magnetic semiconductors via shell-core structure, phase doping, surface structure relaxation, valence alteration and so forth. All of these researches present themselves as a series of significant breakthrough in understanding the magnetic origin of magnetic semiconductors. The related results have been published in world-renowned journals like J. Am. Chem. Soc., Adv. Mater., ACS Nano., and Appl. Phys. Lett., etc.
Introduction：Prof. Wensheng Yan earned his Ph. D at the University of Science and Technology of China in 2003. He is now in charge of the X-ray magnetic circular dichroism (XMCD) endstation of National Synchrotron Radiation Laboratory. By employing the established X-ray absorption methods, he has explored the local atomtic and electronic structures of numerous low-dimensional semiconductors, revealed the interplay of the dimension, structure and magnetism of magnetic semiconductors. To date, he has published above 100 SCI articles in J. Am. Chem. Soc, Adv. Mater., ACS Nano, and Appl. Phys. Lett. etc., which have been cited up to 1500 times by the peers. He has undertaken and accomplished 6 projects (including one key project) sponsored by Chinese National Science Foundation.
Contacts：Group 1502 Hui Sun (89161)