Orbital and spin magnetization of a confined electronicsystem in the transition between a quantum dot and a ring

摘要

In order to understand the orbital and spin magnetization of a confined electronic systemrnwe analyze these ground state properties in the transition from a quantum dot to a quantum ringrnof finite thickness. The Coulomb interaction between the electrons is treated in the Hartree andrnHartree-Fock approximations and special care is taken to include also the contributions of thernnonlocal current to the summation of the magnetic moments of the occupied states. We identifyrnchanges in the many-body structure of the ground state and in the magnetization curves versusrnthe magnetic field and other parameters characterizing the system. We compare the results ofrntwo models for quantum dots (or rings), one with the electrons moving continuously in thernsystem, and one with the electrons moving on a lattice.