Optical three-dimensional profiling of charged domain walls in ferroelectrics by Cherenkov second-harmonic generation
Optical three-dimensional profiling of charged domain walls in ferroelectrics by Cherenkov second-harmonic generation
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DOI：
10.1103/physrevb.89.035314
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发表时间：
2014-01-28
影响因子：
3.7
通讯作者：
Soergel, E.
中科院分区：
文献类型：
--
作者：
Kaempfe, T.;Reichenbach, P.;Soergel, E.
切伦科夫二次谐波产生(CSHG)是铁氧体大块晶体三维磁区壁谱分析的有力工具。在这里，我们应用这种非侵入性的技术来跟踪毫米厚的铁电单晶铌酸锂带电磁区壁(CDW)。CSHG以极高的光学分辨率灵敏地揭示了任何这样的CDW的倾角α>；0。此外，我们推导出完全带电的头部到头部的CDW(α=90度)要粗糙得多，并显示出突起、磁区包裹体和新的拓扑。我们的发现提供了对CDW中电子传输和电荷捕获机制的洞察，这对于它们在未来的纳米电子器件中的使用是强制性的。
Cherenkov second-harmonic generation (CSHG) is a powerful tool for three-dimensional domain wall profiling in ferroic bulk crystals. Here, we apply this noninvasive technique for tracking head-to-head charged domain walls (CDWs) across millimeter-thick ferroelectric single-crystalline lithium niobate. CSHG sensitively reveals the inclination alpha > 0 of any such CDW with a superb optical resolution. Moreover, we deduce fully charged head-to-head CDWs (alpha = 90 degrees) to be much rougher and to show protrusions, domain inclusions, and novel topologies. Our findings provide insight into the mechanisms of electron transport and charge trapping in CDWs, as is mandatory for their use in prospective nanoelectronic devices.