Nano-Scale Theory of Ferroelectric Surface Predicting Skin-Deep Quantized 2D Electron Gas
Nano-Scale Theory of Ferroelectric Surface Predicting Skin-Deep Quantized 2D Electron Gas
复制标题
铁电表面纳米理论预测表深量子化二维电子气
DOI：
10.1080/00150190211028
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发表时间：
2002
期刊：
影响因子：
0.8
通讯作者：
A. Masuda
中科院分区：
文献类型：
--
作者：
Yukio Watanabe;A. Masuda
概述了铁电表面的纳米尺度理论。自洽地求解了具有有限带隙和理想清洁表面的铁电体中电子和自发极化P的分布，作为最小朗道自由能点。通过扩展MOS二极管反型层的公式，将电子运动的量子化和OP效应结合起来。对于一个合理的范围内的o P效应长度尺度LG，理论预测nm薄的电子表面层。量子化增强了o P效应，并将电子层定位在P终止的有效表面下方的几个晶格处。因此，那里的电子部分可以是移动的，这一点得到了最近实验的支持。这使得非常薄的铁电体的畴结构具有自由度和迁移率，即使其表面与导电电极分离。
A nm-scale theory of ferroelectric surface is outlined. The distributions of the electron and the spontaneous polarization P in a ferroelectric having a finite bandgap and an ideally clean surface are selfconsistently solved as the minimum Landau free energy point. The quantization of the electron motion and the o P effect are incorporated by extending the formulation for the MOS diode inversion layer. For a plausible range of the o P effect length scale L G , the theory predicts a nm-thin electron surface layer. The quantization enhances the o P effect and locates the electron layer a few lattice below the effective surface where P terminates. Therefore, the fraction of the electron there can be mobile, which is supported by a recent experiment. This donates the freedom and the mobility to the domain configuration of very thin ferroelectric, even when its surface is separated from a conducting electrode.