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Fabricating van der Waals Heterostructures with Precise Rotational Alignment
Published on: July 5, 2019
Modulation of Metal and Insulator States in 2D Ferromagnetic VS2 by van der Waals Interaction Engineering
Yuqiao Guo1, Haitao Deng1, Xu Sun1
1Hefei 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.
Abstract:
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.
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