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On the origin of surface states in a correlated local-moment film

机译:相关局部矩膜中表面态的起源

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The electronic quasiparticle structure of a ferromagnetic local moment film is investigated within the framework of the s-f model. For the special case of a single electron in an otherwise empty energy band being exchange coupled to a fully ordered localised spin system the problem can be solved exactly and, for the spin-↓ electron, some marked correlation effects can be found. We extend our model to incorporate the influence of the surface on the electronic structure. Therefore we modify the hopping integrals in the vicinity of the surface. This leads to the existence of surface states, both for the spin-↑ and the spin-↓ spectral density of states. The interplay between the modification of the hopping integrals and the existence of surface states and correlation effects is discussed in detail.
机译:在s-f模型的框架内研究了铁磁局部力矩膜的电子准粒子结构。对于特殊的情况,单个电子在否则为空的能带中进行交换,耦合到一个完全有序的局部自旋系统,可以精确地解决该问题;对于自旋↓电子,可以发现一些显着的相关效应。我们扩展了模型,以纳入表面对电子结构的影响。因此,我们修改了曲面附近的跳跃积分。这导致存在自旋↑和自旋↓光谱密度的表面状态。详细讨论了跳跃积分的修改与表面状态的存在以及相关效应之间的相互作用。

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