报告题目Title：Germanene：a new member of the graphene family 锗烯二维材料研究
报 告 人Speaker：Lijie Zhang (University of Twente )
报告时间Time：2018.1.4. 10:00
报告地点Venue：E106 Meeting Room 会议室，太阳集团tyc539量子与分子结构国际中心、太阳集团tyc539物理系 SHU ICQMS
摘要：
Recently, a few research groups have reported the growth of germanene, a new member of the graphene family. Germanene is in many aspects very similar to graphene, but in contrast to the planar graphene lattice, the germanene honeycomb lattice is slightly buckled and composed of two vertically displaced sub-lattices. First principles total energy calculations have revealed that free-standing germanene is a two-dimensional Dirac fermion system, i.e. the electrons behave as massless relativistic particles that are described by the Dirac equation, i.e. the relativistic variant of the Schrödinger equation. We will give a brief update of the growth and electronic properties of germanene on Pt/Ge(110) nanocrystals.
Subsequently, we will show that large and continuous single germanene layers can be grown on molybdenum disulfide (MoS2). The structural and electronic properties of the germanene layer are studied with scanning tunneling microscopy and spectroscopy. The lattice constant of the germanene layer is 3.8±0.1 Å, i.e. substantially larger than the lattice constant of MoS2 (3.16 Å), and the interlayer distance between the germanene layer and the MoS2 substrate is 3.2±0.2 Å, indicating that we are dealing with a low-buckled germanene layer. The density of states of the germanene layer exhibits a V-shape, which is reminiscent of a two-dimensional Dirac system. The minimum of the density of states is located near the Fermi level.
