Dynamical simulation of field emission in nanostructures
Dynamical simulation of field emission in nanostructures
复制标题
纳米结构场致发射的动力学模拟
DOI：
10.1103/physrevb.65.085405
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发表时间：
2002
影响因子：
3.7
通讯作者：
J. Ihm
中科院分区：
文献类型：
--
作者：
Seungwu Han;M. H. Lee;J. Ihm
提出了一种基于第一性原理赝势方法的计算方法，用于计算电场作用下纳米结构的电子发射。利用含时薛定谔方程计算了电子通过势垒的发射率，该方法考虑了纳米结构的三维特性和实际的自洽势，并将该方法应用于碳纳米管场发射，计算结果与实验数据吻合较好，且对电子波函数的空间分布有很强的依赖性。
An efficient computational scheme based on the first-principles pseudopotential method is proposed for the electron emission from nanostructures under an applied electric field. The emission rate of the electron through the potential barrier is calculated by integrating the time-dependent Schr\"odinger equation for the states residing initially inside the emitter. Our approach takes into account the three-dimensional feature of the nanostructure as well as the realistic self-consistent potential. We have applied this method to the field emission of carbon nanotubes. The calculated emission currents are in good agreement with experimental data and exhibit strong dependence on the spatial distributions of the electronic wave functions.