Max-Planck-Institut für Festkörperforschung, D-70569 Stuttgart, Germany.
Nano Lett. 2012 Aug 8;12(8):3900-4. doi: 10.1021/nl300512q. Epub 2012 Jul 16.
The Dirac-like electronic structure of graphene originates from the equivalence of the two basis atoms in the honeycomb lattice. We show that the characteristic parameters of the initial state wave function (sublattice symmetry and isospin) can be determined using angle-resolved photoemission spectroscopy (ARPES) with circularly polarized synchrotron radiation. At a photon energy of hν = 52 eV, transition matrix element effects can be neglected allowing us to determine sublattice symmetry and isospin with high accuracy using a simple theoretical model.
石墨烯的类狄拉克电子结构源于蜂窝晶格中两个基元原子的等价性。我们表明，可以使用圆偏振同步辐射的角分辨光电子能谱（ARPES）来确定初始态波函数的特征参数（子晶格对称性和同位旋）。在光子能量 hν = 52 eV 的情况下，可以忽略跃迁矩阵元效应，这使得我们可以使用简单的理论模型高精度地确定子晶格对称性和同位旋。
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