Multiband energy spectra of spin electrons with two-dimensional magnetic modulations

Ming Che Chang, Min Fong Yang

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The energy spectra of spin-(Formula presented) electrons under two-dimensional magnetic field modulations are calculated beyond the one-band approximation. Our formulation is generally applicable to a modulation field with a rectangular lattice symmetry. The field distribution within a plaquette is otherwise arbitrary. The spectra being obtained are qualitatively different from their electric-modulated counterparts. Peculiar features of the spectra are that, for an electron with a (Formula presented) factor precisely equal to 2, no matter how strong the modulation is, the zero-energy level seems to be unaffected by the modulation and is separated from higher energy levels with a nonzero energy gap. Moreover, there is a twofold degenerancy for all states with positive energies with respect to spin flip. These features agree with earlier analytical studies of the periodically magnetic-modulated systems.

Original languageEnglish
Pages (from-to)13002-13009
Number of pages8
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume57
Issue number20
DOIs
Publication statusPublished - 1998 Jan 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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