Ground-state energies of atoms and atomic chains in strong to superstrong magnetic fields (B≊2.4×${10}^6$ – 8.5×${10}^8$ T) are calculated within the single-particle scheme of a heuristic density-functional method. From these we find condensation energies and binding lengths. Using the local Dirac exchange functional, the corresponding equations are solved iteratively, expanding the wave functions with respect to Landau functions in the transverse directions and directly integrating along the longitudinal direction. Dropping the adiabatic approximation, we extrapolate our results with respect to the number of Landau channels taken into account. The values found by this extrapolation correspond to calculations without any restriction on the allowed wave functions. © 1996 The American Physical Society.

• Received 31 October 1995

DOI:https://doi.org/10.1103/PhysRevA.53.4068