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arXiv 0908.3617cond-mat.mtrl-scicond-mat.mes-hall
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基于第一性原理的铁电纳米线极化场拓扑

Topology of the polarization field in ferroelectric nanowires from first principles

J. W. Hong, G. Catalan, D. N. Fang, Emilio Artacho, J. F. Scott

摘要:

利用第一性原理计算研究了钛酸钡纳米线的横截面极化场。除了铁电纳米结构中已知的织构外,还得到了不同缠绕数的拓扑缺陷。它们是由表面效应和边缘效应在导线表面施加的偏振模式的向内调节引起的。接近拓扑缺陷的极化场在某些情况下取向出基面,保持接近恒定的幅度,而在其他情况下几乎消失。

英文摘要:

The behaviour of the cross-sectional polarization field is explored for thin nanowires of barium titanate from first-principles calculations. Topological defects of different winding numbers have been obtained, beyond the known textures in ferroelectric nanostructures. They result from the inward accommodation of the polarization patterns imposed at the surface of the wire by surface and edge effects. Close to a topological defect the polarization field orients out of the basal plane in some cases, maintaining a close to constant magnitude, whereas it virtually vanishes in other cases.

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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