AI 中文总结
该研究提出将超润滑性与滑动铁电性结合的设计，实现了可连续调控的低势垒超润滑铁电结构，为人工突触器件及相关实际应用提供了新方案。
AI 中文摘要
滑动铁电性广泛存在于各类范德华双层或多层结构中，由公度界面的非对称堆叠诱导。层间滑动可大幅降低开关势垒，实现高速、低能耗，但与非整比界面的超润滑滑动相比，其势垒仍高得多。这类非整比界面的极化不可开关，是将超润滑性与滑动铁电性结合以实现超低势垒的主要障碍。本文基于二维材料横向异质结的前期合成成果，提出了二者结合的设计方案，该方案可广泛适用于包括PN结在内的各类体系。在这种长距离超润滑铁电结构中，垂直极化可通过横向异质结双层间非整比界面的超润滑滑动实现连续调控，其中一系列多稳定态是人工突触器件长期追求的目标。本研究的新颖之处不仅在于势垒首次低至微电子伏特量级，还在于铁电经典范式中不同于微小偏差的超长离子位移。由低垂直电压电驱动的超润滑滑动是首次报道，与此前由针尖机械驱动的滑动相比效率高得多，解决了实际应用的一个主要问题。
英文摘要
Sliding ferroelectricity widely exists in various van der Waals bilayers or multilayers, which is induced by asymmetric stacking of commensurate interface. The greatly reduced switching barriers via interlayer sliding lead to high speed with low energy cost, while they are still much higher compared with superlubric sliding of incommensurate interfaces. The polarizations of such incommensurate interfaces are not switchable, which is the major obstacle of combing superlubricity and sliding ferroelectricity for ultralow barriers. Here we propose a design of such combination based on previous synthesis of lateral heterojunctions of 2D materials, which can be extensively applicable to various systems including PN junctions. In such long-distance superlubric ferroelectricity, the vertical polarization can be continuously controlled by superlubric sliding of incommensurate interfaces between lateral heterojunction bilayers, where the series of multiple stable states are long-sought for artificial synaptic devices. The unconventionality of our findings does not only include unprecedented barriers down to the magnitude of mu-eV, but also unprecedented long ion displacements distinct from the small deviations in classical paradigm of ferroelectricity. Our predicted superlubric sliding electrically driven by low vertical voltage is also hitherto reported, much more efficient compared with previously reported sliding mechanically driven by tips, resolving a major issue for practical applications.
