TY - JOUR

T1 - Multiband energy spectra of spin electrons with two-dimensional magnetic modulations

AU - Chang, Ming Che

AU - Yang, Min Fong

PY - 1998

Y1 - 1998

N2 - 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.

AB - 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.

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U2 - 10.1103/PhysRevB.57.13002

DO - 10.1103/PhysRevB.57.13002

M3 - Article

AN - SCOPUS:0346050335

VL - 57

SP - 13002

EP - 13009

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

SN - 1098-0121

IS - 20

ER -