Abstract
Conditions for the appearance of a spontaneous spin polarization in low-dimensional systems in zero magnetic field are analyzed for the case of low occupation of the lowest quantum-confinement subbands, when the energy of exchange interaction of charge carriers exceeds their kinetic energy. In terms of the Hartree- Fock approximation, the critical densities above which complete spin depolarization of the charge-carrier gas occurs, were determined for quasi-two-dimensional and quasi-one-dimensional systems. The emphasis is on the probable interrelation of the spin depolarization, first, with the transition of a two-dimensional gas to a metallic state and, second, with the evolution of the "0.7(2 e 2 / h ) feature," which is split off from the first step in the staircase function of the quantum conductance of a one-dimensional channel and varies in height from e 2 / h to (3/2) e 2 / h as the density of charge carriers increases. © 2003 MAIK "Nauka/Interperiodica".
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