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Semiconductors

, Volume 37, Issue 12, pp 1390–1399 | Cite as

Spin depolarization in spontaneously polarized low-dimensional systems

  • I. A. Shelykh
  • N. T. Bagraev
  • L. E. Klyachkin
Low-Dimensional Systems

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(2e2/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 e2/h to (3/2)e2/h as the density of charge carriers increases.

Keywords

Charge Carrier Exchange Interaction Electromagnetism Spin Polarization Critical Density 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© MAIK "Nauka/Interperiodica" 2003

Authors and Affiliations

  • I. A. Shelykh
    • 1
  • N. T. Bagraev
    • 2
  • L. E. Klyachkin
    • 2
  1. 1.St. Petersburg State Technical UniversitySt. PetersburgRussia
  2. 2.Ioffe Physicotechnical InstituteRussian Academy of SciencesSt. PetersburgRussia

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