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arXiv 1708.01740cond-mat.mes-hall
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Friedel振荡中的几何相移

Geometrical phase shift in Friedel oscillations

C. Dutreix, P. Delplace

摘要:

本文研究了具有亚晶格自由度的一维晶体中局域杂质的弹性散射问题。这种杂质会对局域态密度产生长程干扰,称为弗里德尔振荡。在这里,我们表明,布洛赫波的内部自由度是负责在弗里德尔振荡的几何相移。能量分辨干涉图样的傅里叶变换揭示了这种相移的拓扑性质,其与不存在杂质时的布洛赫能带结构拓扑有内在联系。因此,在局域态密度中的弗里德尔振荡可以被看作是一个广泛的经典和量子系统,如声学和光子晶体,超冷原子气体在光晶格和电子化合物的波拓扑性质的探针。

英文摘要:

This work addresses the problem of elastic scattering through a localized impurity in a one-dimensional crystal with sublattice freedom degrees. The impurity yields long-range interferences in the local density of states known as Friedel oscillations. Here, we show that the internal degrees of freedom of Bloch waves are responsible for a geometrical phase shift in Friedel oscillations. The Fourier transform of the energy-resolved interference pattern reveals a topological property of this phase shift, which is intrinsically related to the Bloch band structure topology in the absence of impurity. Therefore, Friedel oscillations in the local density of states can be regarded as a probe of wave topological properties in a broad class of classical and quantum systems, such as acoustic and photonic crystals, ultracold atomic gases in optical lattices, and electronic compounds.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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