Application of optical beams to electrons in graphene
Application of optical beams to electrons in graphene
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DOI：
10.1103/physrevb.83.115458
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发表时间：
2011-03
影响因子：
3.7
通讯作者：
A. Matulis;M. R. Masir;F. Peeters
中科院分区：
文献类型：
--
作者：
A. Matulis;M. R. Masir;F. Peeters
光束光学技术被应用于描述狄拉克电子的波函数。该方法通过考虑通过简单的非均匀结构（例如平坦和弯曲的 p-n 结和超晶格）的电子传输来说明。我们发现凸面 p-n 结会压缩束腰，而凹面界面会加宽束腰，但不会失去其聚焦特性。在平坦的 p-n 结处，透射高斯光束的束腰可以变窄或变宽，具体取决于入射角。导出了超晶格中发生光束准直的一般条件，该条件没有前面讨论的那么严格。
The technique of beam optics is applied to the description of the wave function of Dirac electrons. This approach is illustrated by considering electron transmission through simple nonhomogeneous structures, such as flat and bent p-n junctions and superlattices. We found that a convex p-n junction compresses the beam waist, while a concave interface widens it without loosing its focusing properties. At a flat p-n junction the waist of the transmitted Gaussian beam can be narrowed or widened, depending on the angle of incidence. A general condition is derived for the occurrence of beam collimation in a superlattice which is less stringent than previous discussed.