We calculate the x-ray absorption spectra (XAS) for 1s-π⊃* and 1s-σ⊃* transitions in single layer graphene using the dipole approximation and we compare with experimental results. It is found that the in-plane and out-of-plane orientations of the dipole vectors, which correspond to the 1s-π⊃* and 1s-σ⊃* transitions, respectively, are responsible for the polarization dependence of the x-ray absorption intensity in graphene. Using the atomic matrix elements, the low-energy XAS peaks can be assigned.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2012 Mar 9|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics