7003全讯入口“博约学术论坛”系列报告
第90期     (2016年第17期)

Title：The physics of imperfect graphene
报告人：毛金海 博士（美国Rutgers University）
时   间：11月10日（周四）下午1：30
地   点：中心教学楼610
ABSTRACT
Graphene in its pristine form has transformed our understanding of 2D electron systems leading to fundamental discoveries and to the promise of important applications. New and surprising phenomena emerge when the perfect honeycomb lattice of graphene is disrupt-ed. I have investigated the effect of single atom vacancies on gra-phene`s electronic and magnetic properties as revealed by scanning tunneling microscopy and spectroscopy. I will show that it is possible to deposit positive charge at the vacancy site in a controlled fashion and that the charge is stable. In this system we discovered that it is possible to charge the vacancy site into the supercritical regime where an artificial atom forms consisting of the central positive charge and surrounded by a sequence of quasi-bound states which are analogous to atomic collapse states in super-critical nuclei.  We have further demonstrated that the magnetic moment of the vacan-cy can be screened by the conduction electrons, providing evidence of intriguing Kondo screening in this pseudogap system. Moreover I will show that the screening of the magnetic moment can be con-trolled by an external electric field.

Curriculum Vitae
Dr. Jinhai Mao (毛金海) is a postdoctoral scholar in Department of Physics and Astronomy, Rutgers University, US, since 2012. He received his B.S. in Physics from Wuhan University. Then he obtained his Ph. D. in Condensed Matter Physics from Institute of Physics, CAS, 2012, under the supervision of Prof. Hongjun Gao. His research interests include scanning probe microscopy, and transport properties in graphene and other low-dimensional materials.

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