Graphene Sublattice Symmetry and Isospin Determined by Circular Dichroism in Angle-Resolved Photoemission Spectroscopy

被引：48

作者：

Gierz, Isabella ^{[1
]}

Lindroos, Matti ^{[2
]}

Hoechts, Hartmut ^{[3
]}

Ast, Christian R. ^{[1
]}

Kern, Klaus ^{[1
,4
]}

机构：

[1] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany

[2] Tampere Univ Technol, Dept Phys, FIN-33101 Tampere, Finland

[3] Univ Wisconsin, Ctr Synchrotron Radiat, Stoughton, WI 53589 USA

[4] Ecole Polytech Fed Lausanne, Inst Phys Mat Condensee, CH-1015 Lausanne, Switzerland

来源：

NANO LETTERS | 2012年 / 12卷 / 08期

基金：

美国国家科学基金会;

关键词：

Graphene; sublattice symmetry; isospin; circular dichroism; ARPES; EPITAXIAL GRAPHENE; ALLOYS; GRAPHITE; BANDGAP; SOLIDS;

D O I：

10.1021/nl300512q

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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 h nu = 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.

引用

页码：3900 / 3904

页数：5

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