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arXiv 2408.10909cond-mat.dis-nn
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弹性电子散射与同位素无序链中的局域化

Elastic electron scattering and localization in a chain with isotopic disorder

K. S. Denisov, E. Ya. Sherman

AI总结:

该研究通过紧束缚模型揭示同位素无序导致一维系统中弹性电子散射与局域化,发现质量及杂质间距决定背散射,单杂质可吸引电子形成弱束缚态,并实现远距离安德森局域化。

摘要:

我们研究了在一维系统中,由同位素杂质处局域声子模式相互作用引起的普遍存在的同位素无序所导致的弹性电子散射与局域化。通过采用依赖于原子间距离的跳跃矩阵元紧束缚模型,我们发现单个和成对同位素杂质的背散射概率依赖于质量。对于成对杂质,除质量外,同位素之间的距离也起关键作用。单个杂质有效吸引电子,并能产生局域的弱束缚电子态。在存在无序的情况下,正能量处的电子自由程变为有限,相应的安德森局域化在空间尺度上远超杂质间距成为可能。

英文摘要:

We study elastic electron scattering and localization by ubiquitous isotopic disorder in one-dimensional systems appearing due to interaction with phonon modes localized at isotope impurities. By using a tight-binding model with intersite hopping matrix element dependent on the interatomic distance, we find mass-dependent backscattering probability by single and pairs of isotopic impurities. For the pairs, in addition to the mass, the distance between the isotopes plays the critical role. Single impurities effectively attract electrons and can produce localized weakly bound electron states. In the presence of disorder, the electron free path at positive energies becomes finite and the corresponding Anderson localization at the spatial scale greatly exceeding the distance between the impurities becomes possible.

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