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

Abstract

We report non-resonant x-ray Raman scattering (XRS) measurements from hexagonal boron nitride for transferred momentum from 2 to 9 ${\mathring{\mathrm{A}}}^{-1}$ 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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Cited by in corpus (4)

• Angular resolved electron energy loss spectroscopy in hexagonal boron nitride
• Theoretical Treatments of the Bound-Free Contribution and Experimental Best Practice in X-ray Thomson Scattering from Warm Dense Matter
• Sensitive linear response of an electron-hole superfluid in a periodic potential
• Many-body Green's function approach to attosecond nonlinear X-ray spectroscopy