| 报告题目 | Experimental realization and characterization of silicene |
| 报告人 | 陈岚 博士 |
| 报告人单位 | 中国科学院物理研究所 |
| 报告时间 | 2013-01-14 |
| 报告地点 | 合肥微尺度物质科学国家实验室9004会议室 |
| 主办单位 | 合肥微尺度物质科学国家实验室 |
| 报告介绍 | 报告摘要：
Silicene, a single sheet of silicon atoms arranged in a honeycomb lattice, was supposed to have similar physical properties as that of graphene. In this presentation, I will show the first successful growth of monolayer silicene on metal surface through molecular beam epitaxy. The scanning tunneling microscopy investigation reveal Silicene on Ag(111) surface exhibits Ö3´Ö3 honeycomb superstructure and undergoes a phase transition below 40K. First principle calculations show the superstructure of silicene results from the spontaneous ultra buckling and dynamic phase transition of two energy-degenerate and mirror-symmetric Ö3´Ö3 rhombic phases. From the quasiparticle interference (QPI) patterns observed in dI/dV maps, we derived linear energy-momentum dispersion, a large Fermi velocity, and strong decay rates, which prove the existence of chiral Dirac fermions in silicene. Moreover, through mapping the QPI patterns in q space, we find the Dirac cones of silicene are not circular as in graphene, but significantly warped to hexagon. The theoretical calculations reveal that the hexagonal constant energy contours of Dirac cones stem from the unique structure of silicene. 报告人简介： Dr. Chen Lan was graduated and got his B.S degree in department of physics, university of science and technology of China (USTC) in 2001.He received the Ph.D degree in 2007 from Hefei national Lab for physical sciences at micro scale, USTC. After his Ph.D studies, he worked in Nanoscience and Nanotechnology Initiative in National University of Singapore as a postdoc research fellow. Because of his great research achievements, he was awarded the Singapore Millennium Foundation Scholarship in 2008. Since 2010 he became an associate professor in state kay Laboratory for surface physics, Insititue of Physics, Chinese academy of Science. |
