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arXiv · 0804.3114

Time-dependent V-representability on lattice systems

Yonghui Li·C. A. Ullrich
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Abstract

We study the mapping between time-dependent densities and potentials for noninteracting electronic systems on lattices. As discovered recently by Baer [J. Chem. Phys. 128, 044103 (2008)], there exist well-behaved time-dependent density functions on lattices which cannot be associated with any real time-dependent potential. This breakdown of time-dependent V-representability can be tracked down to problems with the continuity equation which arise from discretization of the kinetic-energy operator. Examples are given for lattices with two points and with N points, and implications for practical numerical applications of time-dependent density-functional theory are discussed. In the continuum limit, time-dependent noninteracting V-representability is restored.

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Yonghui Li, C. A. Ullrich. 2008-04-18. Time-dependent V-representability on lattice systems. https://doi.org/10.1063/1.2955733

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