Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
1997-11-24
Phys. Rev. B 57, 013002 (1998)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
12 pages, latex, 8 figures
Scientific paper
10.1103/PhysRevB.57.13002
The energy spectra of spin-1/2 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 g factor precisely being equal to two, 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 two-fold 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.
Chang Ming-Che
Yang Min-Fong
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