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[求助] 石墨烯能带的overlap是什么意思?

文献上有一句话:We show that the continuous change in normalized sheet resistivity from graphite to a bilayer graphene is governed by one unique property, i.e., the band overlap, which markedly increases from 1 meV for a bilayer graphene to 11meV for eight layers and eventually reaches 40meV for graphite.

请问overlap的物理意义是啥?在能带图上是什么样子?谢谢。
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