报告题目：Scanning tunneling microscopy study of germanene: the germanium analogue of graphene(锗烯的STM研究：石墨烯的锗类似物质)
报 告 人：张利杰（荷兰特文特大学）
报告时间：2016年12月16日（周五）14：00
报告地点：校本部G309
邀请人：赵新洛 教授
报告摘要：Germanene, a monolayer allotrope of germanium atoms arranged in a honeycomb structure, is the germanium analogue of graphene. Here in this talk, I will show that two different ways to synthesis germanene. The deposition of several monolayers of Pt on Ge(110) followed by annealing at 1100 K results in the formation of three-dimensional eutectic GePt nanocrystals. Upon cooling down these eutectic GePt nanocrystals phase separate into pure Ge2Pt and Ge phases. The Ge segregrates towards the surface and forms a germanene layer and with a 2D Dirac signature. In the second part I will show the successful synthesis of germanene on molybdenum disulfide (MoS2), a band gap material. Preexisting defects in the MoS2 surface act as preferential nucleation sites for the germanene islands. The lattice constant of the germanene layer (3.8±0.2???) is about 20% larger than the lattice constant of the MoS2 substrate (3.16 ?). Scanning tunneling spectroscopy measurements and density functional theory calculations are in a good agreement revealing that the linearly dispersing bands at the K points.
