Graphene Sublattice Symmetry
and Isospin Determined
by Circular Dichroism in Angle-Resolved Photoemission Spectroscopy
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Abstract
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 <i>h</i>ν = 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