论文标题
碳纳米管中的现场电子发射中的库仑封锁
Coulomb blockade in field electron emission from carbon nanotubes
论文作者
论文摘要
我们报告了单壁碳纳米管（SWCNTS）中库仑封锁（Fe）中库仑阻滞的观察，在发射电子的能量分布中，这表现为Fe电流 - 电压曲线的明显步骤和振荡变化。库仑封锁的出现是通过在电场辅助表面扩散和碳质量的表面扩散而在SWCNT的顶端形成纳米级突起的。所提出的吸附物辅助的Fe机理与与吸附原子的离散电子状态相关的众所周知的谐振隧道大不相同。基于库仑封锁理论的模拟与实验结果非常吻合。由库仑阻滞效应控制的SWCNT场发射器预计将用于为高级真空纳米电子设备开发按需连贯的单电子源。
We report the observation of Coulomb blockade in field electron emission (FE) from single-wall carbon nanotubes (SWCNTs), which is manifested as pronounced steps in the FE current-voltage curves and oscillatory variations in the energy distribution of emitted electrons. The appearance of the Coulomb blockade is explained by the formation of nanoscale protrusions at the apexes of SWCNTs due to the electric field-assisted surface diffusion of adsorbates and carbon adatoms. The proposed adsorbate-assisted FE mechanism is substantially different from the well-known resonant tunneling associated with discrete electronic states of adsorbed atoms. The simulations based on the Coulomb blockade theory are in excellent agreement with the experimental results. The SWCNT field emitters controlled by the Coulomb blockade effect are expected to be used to develop on-demand coherent single-electron sources for advanced vacuum nanoelectronic devices.
