Exciton spectroscopy of hexagonal boron nitride using non-resonant x-ray Raman scattering

Details Exciton spectroscopy of hexagonal boron nitride using non-resonant x-ray Raman scattering Exciton spectroscopy of hexagonal boron nitride using non-resonant x-ray Raman scattering

2007-10-03

arxiv.org/abs/0710.0695v1

Physics

Condensed Matter

Materials Science

Scientific paper

10.1103/PhysRevB.77.165202

We report non-resonant x-ray Raman scattering (XRS) measurements from hexagonal boron nitride for transferred momentum from 2 to 9 $\mathrm{\AA}^{-1}$ along directions both in and out of the basal plane. A symmetry-based argument, together with real-space full multiple scattering calculations of the projected density of states in the spherical harmonics basis, reveals that a strong pre-edge feature is a dominantly $Y_{10}$-type Frenkel exciton with no other \textit{s}-, \textit{p}-, or \textit{d}- components. This conclusion is supported by a second, independent calculation of the \textbf{q}-dependent XRS cross-section based on the Bethe-Salpeter equation.

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