Perspectives on double-excitations in TDDFT

Details Perspectives on double-excitations in TDDFT Perspectives on double-excitations in TDDFT

2011-01-18

arxiv.org/abs/1101.3379v1

Physics

Chemical Physics

Scientific paper

The adiabatic approximation in time-dependent density functional theory (TDDFT) yields reliable excitation spectra with great efficiency in many cases, but fundamentally fails for states of double excitation character. We discuss how double-excitations are at the root of some of the most challenging problems for TDDFT today. We then present new results for (i) the calculation of autoionizing resonances in the helium atom, (ii) understanding the nature of the double excitations appearing in the quadratic response function, and (iii) retrieving double-excitations through a real-time semiclassical approach to correlation in a model quantum dot.

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