半導体表面上の原子サイズ細線における強磁性の可能性

概要

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By using the first-principles calculations within a local density approach, we examined the atomic and electronic structures of Ga and As atomic wires fabricated on the H-terminated Si surface. Based on the effective tight-binding models relevant to these atomic wires, we also examined the magnetic properties of the corresponding Hubbard models. We rigorously showed that these models exhibit so-called flat-band ferromagnetism, based on the Mielke-Tasaki theorem, and numerically found that the ferromagnetic state is stable against some deviations from completely flat band. The present result will be useful as a guiding principle to design magnetic materials that possibly display the flat-band ferromagnetism.
1999-02-01