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[求助]
請(qǐng)教關(guān)于石墨烯中狄拉克點(diǎn)和狄拉克錐
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| 我是新手,想問一下,石墨烯中狄拉克點(diǎn)和狄拉克錐倒是什么,是怎么產(chǎn)生的,有什么意義,對(duì)它的性質(zhì)有什么影響,謝謝。 |
沒結(jié)果暫時(shí) |
木蟲 (正式寫手)
木蟲 (正式寫手)

銀蟲 (小有名氣)
新蟲 (初入文壇)
Graphene differs from most conventional three-dimensional materials. Intrinsic graphene is a semi-metal or zero-gap semiconductor. Understanding the electronic structure of graphene is the starting point for finding the band structure of graphite. It was realized as early as 1947 by P. R. Wallace that the E-k relation is linear for low energies near the six corners of the two-dimensional hexagonal Brillouin zone, leading to zero effective mass for electrons and holes. Due to this linear (or “conical" dispersion relation at low energies, electrons and holes near these six points, two of which are inequivalent, behave like relativistic particles described by the Dirac equation for spin 1/2 particles. Hence, the electrons and holes are called Dirac fermions, and the six corners of the Brillouin zone are called the Dirac points. |
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