Bilayers of two-dimensional van der Waals materials that lack an inversion center can show a novel form of ferroelectricity, where certain stacking arrangements of the two layers lead to an interlayer polarization. Under an external out-of-plane electric field, a relative sliding between the two layers can occur, accompanied by an interlayer charge transfer and a ferroelectric switching. We show that the domain walls that mediate ferroelectric switching are a locus of strong attractive interactions between electrons. The attraction is mediated by the ferroelectric domain wall fluctuations, effectively driven by the soft interlayer shear phonon. We comment on the possible relevance of this attraction mechanism to the recent observation of an interplay between sliding ferroelectricity and superconductivity in bilayer Td−MoTe2. We also discuss the possible role of this mechanism in the superconductivity of moiré bilayers. Published by the American Physical Society 2024

中文翻译：

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滑动铁电体中畴壁涨落的超导性


缺乏反转中心的二维范德华材料的双层可以显示出一种新颖的铁电形式，其中两层的某些堆叠排列导致层间极化。在外部平面外电场下，两层之间可能会发生相对滑动，并伴有层间电荷转移和铁电开关。我们表明，介导铁电开关的畴壁是电子之间强吸引力相互作用的基因座。这种吸引力是由铁电畴壁涨落介导的，由软层间剪切声子有效驱动。我们评论了这种吸引机制与最近观察到的双层 Td-MoTe2 中滑动铁电和超导性之间相互作用的可能相关性。我们还讨论了这种机制在莫尔双层超导性中的可能作用。 美国物理学会 2024 年出版