Abstract
We present the optical conductivity as well as the electron-energy loss spectra of the alkali metals Na, K, Rb, and Cs calculated within time-dependent current-density functional theory. Our ab initio formulation describes from first principles both the Drude-tail and the interband absorption of these metals as well as the most dominant relativistic effects. We show that by using a recently derived current functional [Berger, Phys. Rev. Lett. 115, 137402 (2015)] we obtain an overall good agreement with experiment at a computational cost that is equivalent to the random-phase approximation. We also highlight the importance of the choice of the exchange-correlation potential of the ground state.
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Contribution to the Topical Issue “Special issue in honor of Hardy Gross”, edited by C.A. Ullrich, F.M.S. Nogueira, A. Rubio, and M.A.L. Marques.
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Ferradás, R., Berger, J.A. & Romaniello, P. Optical properties from time-dependent current-density-functional theory: the case of the alkali metals Na, K, Rb, and Cs. Eur. Phys. J. B 91, 119 (2018). https://doi.org/10.1140/epjb/e2018-90122-9
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DOI: https://doi.org/10.1140/epjb/e2018-90122-9