Enhanced excitonic effects in the energy loss spectra of LiF and Ar at large momentum transfer

Details Enhanced excitonic effects in the energy loss spectra of LiF and Ar at large momentum transfer Enhanced excitonic effects in the energy loss spectra of LiF and Ar at large momentum transfer

2012-04-12

arxiv.org/abs/1204.2724v1

Physics

Condensed Matter

Materials Science

Scientific paper

It is demonstrated that the bootstrap kernel [\onlinecite{sharma11}] for finite values of ${\bf q}$ crucially depends upon the matrix character of the kernel and gives results of the same good quality as in the ${\bf q} \rightarrow 0$ limit. The bootstrap kernel is further used to study the electron loss as well as absorption spectra for Si, LiF and Ar for various values of ${\bf q}$. The results show that the excitonic effects in LiF and Ar are enhanced for values of ${\bf q}$ away from the $\Gamma$-point. The reason for this enhancement is the interaction between the exciton and high energy inter-band electron-hole transitions. This fact is validated by calculating the absorption spectra under the influence of an external electric field. The electron energy loss spectra is shown to change dramatically as a function of ${\bf q}$.

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