Our argument used in Section 2 can be applied to τ, ϵ, [CFK∞(−)], and δpk in a similar way. We begin with an observation based on Hom’s work, which will be used to reduce the cases of ϵ and [CFK∞(−)] to the case of τ.
Despite having outstanding electrical properties, graphene is unsuitable for optical devices because of its zero band gap. Here, we report two-dimensional excitonic photoluminescence (PL) from graphene grown on Cu(111) surface, which shows an unexpe…
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