A discrete density matrix theory for atoms in strong magnetic fields

Abstract

This paper concerns the asymptotic ground state properties of heavy atoms in strong, homogeneous magnetic fields. In the limit when the nuclear charge Z tends to infinity with the magnetic field B satisfying B >> Z^{4/3} all the electrons are confined to the lowest Landau band. We consider here an energy functional, whose variable is a sequence of one-dimensional density matrices corresponding to different angular momentum functions in the lowest Landau band. We study this functional in detail and derive various interesting properties, which are compared with the density matrix (DM) theory introduced by Lieb, Solovej and Yngvason. In contrast to the DM theory the variable perpendicular to the field is replaced by the discrete angular momentum quantum numbers. Hence we call the new functional a discrete density matrix (DDM) functional. We relate this DDM theory to the lowest Landau band quantum mechanics and show that it reproduces correctly the ground state energy apart from errors due to the indirect part of the Coulomb interaction energy.

LaTeX2e, 22 pages

Cited by in corpus (5)

• Bounds on one-dimensional exchange energies with application to lowest Landau band quantum mechanics
• Semi-classical limit of confined fermionic systems in homogeneous magnetic fields
• One-dimensional models for atoms in strong magnetic fields, II: Anti-Symmetry in the Landau Levels
• Gradient corrections for semiclassical theories of atoms in strong magnetic fields
• Semiclassics in the lowest Landau band