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arXiv 0811.3802cond-mat.mes-hallcond-mat.str-el
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反对称电势阶跃诱导双层石墨烯中的拓扑电荷局域化

Topological charge localization in bilayer graphene induced by an antisymmetric electric potential step

J. C. Martinez, M. B. A. Jalil, S. G. Tan

摘要:

能量小于其所入射的电势阶跃的带电粒子预期会经历部分反射和透射。然而,在双层石墨烯中,由于颗粒与其手性伴侣之间的相互作用,反对称扭结形式的潜在步骤导致颗粒定位。研究发现,当电势阶跃超过某一阈值时,系统出现零能模,并导致扭结获得电荷。出乎意料的是,在零模式附近的霍尔效应平台对应于单层。这些扭结诱导效应的拓扑性质和扭结在实践中可以产生的容易性,暗示了例如在信息存储或开关设备中的可能应用。

英文摘要:

A charged particle whose energy is less than the electric potential step it is incident upon, is expected to undergo partial reflection and transmission. In bilayer graphene, however, a potential step in the form of an antisymmetric kink results in particle localization due to the interaction between the particle and its chiral partner. It is found that when the potential step exceeds a threshold, zero-energy modes of the system emerge, and causes the kink to acquire a charge. The Hall-effect plateaus in the vicinity of the zero modes correspond, unexpectedly, to those of the monolayer. The topological nature of these kink-induced effects and the ease with which a kink can be generated in practice, suggest possible applications in e.g. storage of information or switching devices.

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。

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