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Optical absorption spectra of finite systems from a conserving Bethe-Salpeter equation approach

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Abstract

We present a method for computing optical absorption spectra by means of a Bethe-Salpeter equation approach, which is based on a conserving linear response calculation for electron-hole coherences in the presence of an external electromagnetic field. This procedure allows, in principle, for the determination of the electron-hole correlation function self-consistently with the corresponding single-particle Green function. We analyze the general approach for a “one-shot” calculation of the photoabsorption cross section of finite systems, and discuss the importance of scattering and dephasing contributions in this approach. We apply the method to the closed-shell clusters Na4, Na\(^{+}_{9}\) and Na\(^{+}_{21}\), treating one active electron per Na atom.

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Correspondence to G. Pal or H. C. Schneider.

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Pal, G., Pavlyukh, Y., Hübner, W. et al. Optical absorption spectra of finite systems from a conserving Bethe-Salpeter equation approach. Eur. Phys. J. B 79, 327–334 (2011). https://doi.org/10.1140/epjb/e2010-10033-1

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