Response function analysis of excited-state kinetic energy functional   constructed by splitting k-space
  Over the past decade, fundamentals of time independent density functional theory for excited state have been established. However, construction of the corresponding energy functionals for excited states remains a challenging problem. We have developed a method for constructing functionals for excited states by splitting k-space according to the occupation of orbitals. In this paper we first show the accuracy of kinetic energy functional thus obtained. We then perform a response function analysis of the kinetic energy functional proposed by us and show why method of splitting the k-space could be the method of choice for construction of energy functionals for excited states. 
M. Hemanadhan and Manoj K. Harbola
cond-mat.other physics.atm-clus physics.atom-ph