能带结构对石墨场发射的影响
Effect of band structure on field emission of crystalline graphite
摘要：
本文用一种简单的解析方法研究了结晶AAA石墨的场发射，并考虑了费米能级附近的色散关系。发射电流计算两个晶体取向相对于所施加的电场。结果表明，Fowler-Nordheim方程的指数保持不变，而指前因子被显著修改。对于这两个领域的方向，线性领域的依赖性被发现在弱场和标准的二次福勒Nordheim行为发生在强场。从层间距离的发射电流的强烈依赖性进行观察。作为该方法的说明，考虑单壁碳纳米管的已知情况。
英文摘要：
The field emission of crystalline AAA graphite is studied within a simple analytical approach with account of the exact dispersion relation near the Fermi level. The emission current is calculated for two crystal orientations with respect to the applied electric field. It is found that the exponent of the Fowler-Nordheim equation remains the same while the preexponential factor is markedly modified. For both field directions, the linear field dependence is found in weak fields and the standard quadratic Fowler-Nordheim behavior takes place in strong fields. A strong dependence of the emission current from the interlayer distance is observed. As an illustration of the method the known case of a single-walled carbon nanotube is considered.
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