Anisotropic excitonic effects in the energy loss function of hexagonal boron nitride

Details Anisotropic excitonic effects in the energy loss function of hexagonal boron nitride Anisotropic excitonic effects in the energy loss function of hexagonal boron nitride

2010-05-06

arxiv.org/abs/1005.0930v1

Physics

Condensed Matter

Materials Science

10 pages, 4 figures

Scientific paper

We demonstrate that the valence energy-loss function of hexagonal boron nitride (hBN) displays a strong anisotropy in shape, excitation energy and dispersion for momentum transfer q parallel or perpendicular to the hBN layers. This is manifested by e.g. an energy shift of 0.7 eV that cannot be captured by single-particle approaches and is a demonstration of a strong anisotropy in the two-body electron-hole interaction. Furthermore, for in-plane directions of q we observe a splitting of the -plasmon in the M direction that is absent in the K direction and this can be traced back to band-structure effects.

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