3 years ago

Modulation of Metal and Insulator States in 2D Ferromagnetic VS2 by van der Waals Interaction Engineering

Modulation of Metal and Insulator States in 2D Ferromagnetic VS2 by van der Waals Interaction Engineering
Xiaojun Wu, Haitao Deng, Yi Xie, Sijia Zhang, Jiyin Zhao, Xu Sun, Haibin Pan, Yuqiao Guo, Changzheng Wu, Wangsheng Chu, Xiuling Li, Xusheng Zheng, Junchi Wu, Changqing Jin
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 (VS2), 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 VS2. An overall control of the electronic states of VS2 is also demonstrated: bond-enlarging triggering a metal-to-semiconductor electronic transition and bond-compression inducing metallization in 2D VS2. The pristine VS2 lattice thus provides a new platform for precise manipulation of both charge and spin degrees of freedom in 2D TMDCs availing spintronic applications. Van der Waals interaction engineering in VS2 brings the first intrinsic ferromagnetic semiconductor in 2D transition-metal dichalcogenides (TMDCs). An experimental realization of intrinsic magnetic ordering in a pristine TMDC lattice is reported. The pristine VS2 lattice provides a new platform for precise manipulation of both charge and spin degrees of freedom in 2D TMDCs, availing spintronic applications.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/adma.201700715

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