论文标题
符合应变的浆果曲率，尿酸乳酸酯铬
Strain-tunable Berry curvature in quasi-two-dimensional chromium telluride
论文作者
论文摘要
磁过渡金属葡萄构构成了一个新兴平台，用于探索自旋轨道驱动的浆果相现象，这是由于拓扑和磁性之间的非平凡相互作用。在这里，我们表明，原始CR2TE3薄膜中的异常大厅效应在非零磁化时表现出独特的温度依赖性符号逆转，这是由于动量空间浆果曲率由First-Principles Simulates确定的。符号变化是可调节的，可通过准二维CR2TE3外延外延膜中尖锐而定义明确的底物/膜界面启用，通过扫描透射透射电子显微镜和深度敏感的偏振中子反射仪显示出来。这种浆果相效应进一步引入了磁化切换过程中强制性场附近原始CR2TE3中的驼峰形霍尔峰，这是由于存在应变调节的磁性域。 CR2TE3薄膜中浆果曲率的多功能接口可调节性为拓扑电子提供了新的机会。
Magnetic transition metal chalcogenides form an emerging platform for exploring spin-orbit driven Berry phase phenomena owing to the nontrivial interplay between topology and magnetism. Here we show that the anomalous Hall effect in pristine Cr2Te3 thin films manifests a unique temperature-dependent sign reversal at nonzero magnetization, resulting from the momentum-space Berry curvature as established by first-principles simulations. The sign change is strain tunable, enabled by the sharp and well-defined substrate/film interface in the quasi-two-dimensional Cr2Te3 epitaxial films, revealed by scanning transmission electron microscopy and depth-sensitive polarized neutron reflectometry. This Berry phase effect further introduces hump-shaped Hall peaks in pristine Cr2Te3 near the coercive field during the magnetization switching process, owing to the presence of strain-modulated magnetic domains. The versatile interface tunability of Berry curvature in Cr2Te3 thin films offers new opportunities for topological electronics.
