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Nearly Free Electron States in Graphene Nanoribbon Superlattices

Nearly free electron (NFE) state is an important kind of unoccupied state in low dimensional systems. Although it is intensively studied, a clear picture on its physical origin and its response behavior to external perturbations is still not available. Our systematic first-principles study based on graphene nanoribbon superlattices suggests that there are actually two kinds of NFE states, which can be understood by a simple Kronig-Penney potential model. An atom-scattering-free NFE transport channel can be obtained via electron doping, which may be used as a conceptually new field effect transistor.

preprint2010arXivOpen access
Shuanglin HuZhenyu LiQiaohong LiuXudong XiaoJ. G. HouJinlong Yang
cond-mat.mes-hallcond-mat.mtrl-sci
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Shuanglin HuZhenyu LiQiaohong LiuXudong XiaoJ. G. HouJinlong Yang

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