Peierls相变与磁场中碳纳米管的场发射

• 作 者: 孙海军 梁世东
• 机 构: 中山大学物理科学与工程技术学院,中山大学物理科学与工程技术学院 广州510275,广州510275
• 出 处: 物理学报
• 发表日期: 2008年03期
• 关键词: 场发射 碳纳米管 Peierls相变

应用紧束缚模型和WKB方法研究碳纳米管的out-of-plane型Peierls相变,及其对碳纳米管的场发射的影响.结果发现Peierls相变会在室温出现,并使碳纳米管费米面附近出现能隙,导致碳纳米管发生金属—半导体转变,从而抑制碳纳米管的场发射.磁场也会抑制Peierls形变,Peierls相变和磁场相互竞争影响碳纳米管的能带结构,从而影响碳纳米管的场发射.

The tight-binding model and the WKB method were used to study the out-of-plane Peierls transformation of carbon nanotubes and their effect on the field emission of carbon nanotubes. It was found that Peierls phase transformation appeared at room temperature, The energy gap appears near the rice surface, which causes the metal-semiconductor transition of the carbon nanotubes and thus the field emission of the carbon nanotubes. The magnetic field also suppresses the Peierls deformation. The Peierls phase transition and the magnetic field compete with each other to affect the energy band structure of the carbon nanotubes, Field emission of carbon nanotubes.