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北京石油化工学院2026年研究生招生接收调剂公告
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taozhikai

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[资源] nature Asia Mat 最新评论:晶体硅太阳能工业化进展

A brief review is given on the characteristic features of electronic states and transport in graphene consisting of a single sheet
of graphite, and its cylinder form called a carbon nanotube. Electron motion in graphene is equivalent to that of a neutrino or a
relativistic Dirac electron with vanishing rest mass. This causes the appearance of a nontrivial Berry’s phase under 2π rotation in
wave-vector space, leading to the absence of backscattering and in the metallic carbon nanotube resulting in perfect conduction
even in the presence of scatterers. The energy bands in carbon nanotubes are determined by periodic boundary conditions with a
fi ctitious Aharonov-Bohm fl ux determined uniquely by the circumferential chiral vector. A nanotube becomes metallic when the
fl ux vanishes and semiconducting when the fl ux is nonzero. The conductivity of graphene is essentially independent of the Fermi
energy and the electron concentration as long as variations in eff ective scattering strength are neglected, and therefore graphene
should be regarded as a metal rather than a zero-gap semiconductor. Various schemes are now being proposed and tested for the
purpose of opening the band gap in graphene.
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zhm638

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★★★ 三星级,支持鼓励

我需要这些信息,多谢!
10楼2011-06-11 10:42:27
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我学这个的,还是英文,得好好看一下最新进展,东西不错,谢谢分享!
13楼2011-08-10 13:57:38
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