Coupled cluster theory for the ground and excited states of two-dimensional quantum dots

We present a study of the two-dimensional circular quantum dot model Hamiltonian using range chemical ab initio methods. Ground and excited state energies are computed on different levels perturbation theories, including coupled cluster method. outline scheme to compute required Coulomb integrals in real space utilize semianalytic solution integral over kernel vicinity singularity. Furthermore, we show that remaining basis set incompleteness error for dots scales with inverse number virtual orbitals, allowing us extrapolate complete limit energy. By varying harmonic potential parameter tune correlation strength investigate predicted ground energies.