Heterodimensional superlattice with in-plane anomalous Hall effect
Heterodimensional superlattice with in-plane anomalous Hall effect
复制标题
具有面内反常霍尔效应的异维超晶格
DOI：
10.1038/s41586-022-05031-2
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发表时间：
2022-09-01
期刊：
影响因子：
64.8
通讯作者：
Liu, Zheng
中科院分区：
文献类型：
--
作者：
Zhou, Jiadong;Zhang, Wenjie;Liu, Zheng
超晶格-两种或多种材料的二维层的周期性堆叠-为具有定制特性的工程材料提供了多功能方案（1，2）。在这里，我们报告了一个内在的异质维超晶格组成的交替层的二维二硫化钒（VS 2）和一维硫化钒（VS）链阵列，直接通过化学气相沉积沉积。这种独特的超晶格具有非常规的1 T堆叠，具有通过扫描透射电子显微镜鉴定的VS 2/VS层的单斜晶胞。一个意想不到的霍尔效应，持续到380开尔文，观察时，磁场是在平面内，霍尔效应通常消失的条件下。这种效应的观测得到了理论计算的支持，并且可以归因于一种非常规的反常霍尔效应，这种反常霍尔效应是由面内磁场引起的面外Berry曲率引起的，它与一维VS链有关。我们的工作扩展了对超晶格的传统理解，并将促进更非凡的超结构的合成。
Superlattices-a periodic stacking of two-dimensional layers of two or more materials-provide a versatile scheme for engineering materials with tailored properties(1,2). Here we report an intrinsic heterodimensional superlattice consisting of alternating layers of two-dimensional vanadium disulfide (VS2) and a one-dimensional vanadium sulfide (VS) chain array, deposited directly by chemical vapour deposition. This unique superlattice features an unconventional 1T stacking with a monoclinic unit cell of VS2/VS layers identified by scanning transmission electron microscopy. An unexpected Hall effect, persisting up to 380 kelvin, is observed when the magnetic field is in-plane, a condition under which the Hall effect usually vanishes. The observation of this effect is supported bytheoretical calculations, and can be attributed to an unconventional anomalous Hall effect owing to an out-of-plane Berry curvature induced by an in-plane magnetic field, which is related to the one-dimensional VS chain. Our work expandsthe conventional understanding of superlattices and will stimulate the synthesis of more extraordinary superstructures.