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首页> 外文期刊>Physical review >Monatomic Au Wire With A Magnetic Ni Impurity: Electronic Structure And Ballistic Conductance
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Monatomic Au Wire With A Magnetic Ni Impurity: Electronic Structure And Ballistic Conductance

机译:具有磁性镍杂质的单原子金线:电子结构和弹道电导

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摘要

The influence of a magnetic impurity (Ni atom) on the electronic, magnetic, and Landauer conductance properties of a monatomic Au wire is studied by first-principles density-functional calculations. We compare two adsorption geometries: bridge and substitutional. We find that the Ni atom remains magnetic in both cases; however, in the bridge geometry, the total spin is close to 1/2 and the symmetry of the hole is d_(3z~2-r~2) while in substitutional it is larger than 1/2 with two degenerate holes with symmetry d_(yz) and d_(zx). By using the Buettiker-Landauer theory, we find that in the first case the ideal, frozen spin conductance is somewhat diminished by the Ni impurity, although quite sensitive to calculation details such as the position of the empty Ni d and .s states, while in the substitutional case conductance remains close to the ideal value G_0 (=2e~2/h) of the pristine gold wire.
机译:通过第一性原理密度泛函计算研究了磁性杂质(Ni原子)对单原子金线的电子,磁性和Landauer电导特性的影响。我们比较了两种吸附几何结构:桥式和置换式。我们发现,在两种情况下,Ni原子均保持磁性。然而,在桥梁几何形状中,总自旋接近于1/2,孔的对称性为d_(3z〜2-r〜2),而在替代中,两个对称的d_退化孔的孔径大于1/2。 (yz)和d_(zx)。通过使用Buettiker-Landauer理论,我们发现在第一种情况下,理想的冻结自旋电导因Ni杂质而有所降低,尽管它对计算细节(例如空Ni d和.s态的位置)非常敏感,而在替代情况下,电导保持接近原始金线的理想值G_0(= 2e〜2 / h)。

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