Hefei National Laboratory for Physical Sciences at the Microscale, and, iChEM (Collaborative Innovation Centre of Chemistry for Energy Materials), University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China.
CAS Key Laboratory of Materials for Energy Conversion, School of Chemistry and Materials Sciences, and, CAS Center for Excellence in Nanoscience, University of Science and Technology of China, Hefei, Anhui, 230026, China.
Adv Mater. 2017 Aug;29(29). doi: 10.1002/adma.201700715. Epub 2017 Jun 6.
2D transition-metal dichalcogenides (TMDCs) are currently the key to the development of nanoelectronics. However, TMDCs are predominantly nonmagnetic, greatly hindering the advancement of their spintronic applications. Here, an experimental realization of intrinsic magnetic ordering in a pristine TMDC lattice is reported, bringing a new class of ferromagnetic semiconductors among TMDCs. Through van der Waals (vdW) interaction engineering of 2D vanadium disulfide (VS ), dual regulation of spin properties and bandgap brings about intrinsic ferromagnetism along with a small bandgap, unravelling the decisive role of vdW gaps in determining the electronic states in 2D VS . An overall control of the electronic states of VS is also demonstrated: bond-enlarging triggering a metal-to-semiconductor electronic transition and bond-compression inducing metallization in 2D VS . The pristine VS lattice thus provides a new platform for precise manipulation of both charge and spin degrees of freedom in 2D TMDCs availing spintronic applications.
二维过渡金属二卤族化合物（TMDCs）是当前纳米电子学发展的关键。然而，TMDCs 主要是非磁性的，这极大地阻碍了它们在自旋电子学应用方面的进展。本文报道了在原始 TMDC 晶格中实现本征磁有序的实验，在 TMDC 中引入了一类新的铁磁半导体。通过二维二硫化钒（VS ）的范德华（vdW）相互作用工程，自旋特性和能隙的双重调节导致了本征铁磁性和小能隙，揭示了 vdW 间隙在决定二维 VS 电子态方面的决定性作用。还证明了对 VS 电子态的整体控制：键的扩大导致金属-半导体的电子跃迁，而键的压缩导致二维 VS 的金属化。原始 VS 晶格为在二维 TMDC 中精确操纵电荷和自旋自由度提供了一个新平台，从而为自旋电子学应用提供了可能。
