Department of Physics and Engineering Physics, Tulane University , New Orleans, Louisiana 70118, United States.
National Graphene Institute, University of Manchester , Manchester M139PL, United Kingdom.
ACS Nano. 2017 Nov 28;11(11):11330-11336. doi: 10.1021/acsnano.7b05856. Epub 2017 Oct 16.
This work reports an experimental study on an antiferromagnetic honeycomb lattice of MnPS that couples the valley degree of freedom to a macroscopic antiferromagnetic order. The crystal structure of MnPS is identified by high-resolution scanning transmission electron microscopy. Layer-dependent angle-resolved polarized Raman fingerprints of the MnPS crystal are obtained, and the Raman peak at 383 cm exhibits 100% polarity. Temperature dependences of anisotropic magnetic susceptibility of the MnPS crystal are measured in a superconducting quantum interference device. Anisotropic behaviors of the magnetic moment are explored on the basis of the mean field approximation model. Ambipolar electronic conducting channels in MnPS are realized by the liquid gating technique. The conducting channel of MnPS offers a platform for exploring the spin/valleytronics and magnetic orders in 2D limitation.
这项工作报道了一项关于 MnPS 反铁磁蜂窝晶格的实验研究，该晶格将谷自由度与宏观反铁磁有序耦合在一起。通过高分辨率扫描透射电子显微镜确定了 MnPS 的晶体结构。获得了 MnPS 晶体的层依赖角分辨偏振拉曼指纹，在 383cm 处的拉曼峰表现出 100%的极性。在超导量子干涉仪中测量了 MnPS 晶体各向异性磁化率的温度依赖性。基于平均场近似模型，研究了磁矩的各向异性行为。通过液体门控技术实现了 MnPS 中的双极性电子传导通道。MnPS 的传导通道为探索二维限制中的自旋/谷电子学和磁有序提供了一个平台。
