Plasmon spectroscopy of free-standing graphene films
Plasmon spectroscopy of free-standing graphene films
复制标题
DOI：
10.1103/physrevb.77.233406
复制
发表时间：
2008-06-01
影响因子：
3.7
通讯作者：
Briddon, P. R.
中科院分区：
文献类型：
--
作者：
Eberlein, T.;Bangert, U.;Briddon, P. R.
等离子体激元光谱的最薄的可能的膜，一个单层的碳原子：石墨烯，已经进行了结合从头计算的低损失函数。我们观察到π和π + σ-表面等离子体模式在独立的单片在4.7和14.6 eV，这是从它们的值在石墨大幅红移。这些模式与理论光谱非常一致，理论光谱发现石墨烯的π-和π + Σ面内模式在4.8和14.5 eV处。我们还发现，有一点损失所造成的能量小于约10 eV的面外模式。
Plasmon spectroscopy of the thinnest possible membrane, a single layer of carbon atoms: graphene, has been carried out in conjunction with ab initio calculations of the low loss function. We observe pi and pi+sigma-surface plasmon modes in free-standing single sheets at 4.7 and 14.6 eV, which are substantially redshifted from their values in graphite. These modes are in very good agreement with the theoretical spectra, which find the pi- and pi+sigma in-plane modes of graphene at 4.8 and 14.5 eV. We also find that there is little loss caused by out-of-plane modes for energies less than about 10 eV.