毕业论文_L型石墨烯纳米条带输运性质.docVIP

毕业设计(论文) 课 题 名 称 学 生 姓 名 学 号 系、年级专业 2010级物理学 指 导 教 师 职 称 2014年5月25日  摘要 石墨烯是一种Graphene is a composed of carbon atoms in a plane film, honeycomb, its thickness is only equivalent to a carbon atom. Graphene is easy to cut into various quasi one-dimensional nanostructures, including two kinds of typical nanoribbons, they are armchair-edge and zigzag-egde graphene nanoribbons. This thesis mainly studies the transport property of L-shaped graphene nanoribbons. The thesis is divided into four chapters. The first chapter briefly introduces the discovery of graphene, preparation method and application background. The second chapter introduces the properties and structure of grapheme and its nanoribbons. The third chapter is our research, we study the transport property of L-shaped graphene nanoribbon by using the nonequilibrium Green’s function method. It is shown that, the conductance of L–shaped graphene nanoribbon displays oscillation behavior. Moreover, the conductance is sensitive to the geometry structure of graphene nanoribbon. In chapter four, a summary of the work and an outlook of this topic are given. Key words: graphene；L-shaped graphene nanoribbon; Electronical transport property  目录 中文摘要..................................................... Ⅰ 英文摘要..................................................... Ⅱ 1引言.......... ...........................................1 1.1 石墨烯的发现 2 石墨烯纳米带的能带结构....................................... 4 2.1能带理论................................................... 4 2.2 扶手椅型边缘石墨烯纳米带的能带结构..........................7 2.3 锯齿型边缘石墨烯纳米带的能带结构........................... 9 3 L型石墨烯纳米条带的输运性质................................10 3.1 引言...................................................... 10 3.2模型