arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0808.3198cond-mat.mes-hall
收藏

石墨烯超晶格中的电子束超准直

Electron Beam Supercollimation in Graphene Superlattices

Cheol-Hwan Park, Young-Woo Son, Li Yang, Marvin L. Cohen, Steven G. Louie

摘要:

虽然电子和光子本质上是不同的,但在过去的二十年里,将光学中有用的概念引入到执行类似功能的电子设备中一直在积极追求。特别地,电子束的准直是一个长期的目标。我们表明,弹道传播的电子束与虚拟没有空间扩展或衍射,没有波导或外部磁场,可以实现在石墨烯下的实验可行的一维外部周期性电位适当的类。载流子所处的新的手性准一维金属态起源于石墨烯中的载流子的固有螺旋性质由于超晶格势而崩塌。除了提供一种在二维中构建手性一维状态的新方法外,我们的发现还可用于基于石墨烯的电子器件(例如,用于信息处理)利用光学中的一些高度发展的概念。

英文摘要:

Although electrons and photons are intrinsically different, importing useful concepts in optics to electronics performing similar functions has been actively pursued over the last two decades. In particular, collimation of an electron beam is a long-standing goal. We show that ballistic propagation of an electron beam with virtual no spatial spreading or diffraction, without a waveguide or external magnetic field, can be achieved in graphene under an appropriate class of experimentally feasible one-dimensional external periodic potentials. The novel chiral quasi-one-dimensional metallic state that the charge carriers are in originates from a collapse of the intrinsic helical nature of the charge carriers in graphene owing to the superlattice potential. Beyond providing a new way to constructing chiral one-dimensional states in two dimensions, our findings should be useful in graphene-based electronic devices (e.g., for information processing) utilizing some of the highly developed concepts in optics.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑