Magnetic Weyl semimetals (WSMs) bearing long-time pursuing are still very rare. We herein identified magnetic exchange induced Weyl state in EuCd 2 Sb 2 , a semimetal in type IV magnetic space group, via performing high magnetic field

The investigation and control of quantum degrees of freedom (DoF) of carriers lie at the heart of condensed-matter physics and next-generation electronics/optoelectronics. Van der Waals heterostructures stacked from distinct two-dimensional (2D) crystals offer an unprecedented platform for combining the superior properties of individual 2D materials and manipulating spin, layer and valley DoFs. MoS 2 /graphene heterostructures, harboring prominent spin transport properties of graphene, giant spin-orbit coupling and spin-valley polarization of MoS 2 , are predicted as a perfect venue for optospintronics. Here, we report the epitaxial growth of commensurate MoS 2 on graphene with high-quality by chemical vapor deposition, and demonstrate robust temperature-independent spin-valley polarization at off-resonant excitation for the first time. We further show that the helicity of B exciton is larger than that of A exciton, allowing the manipulation of spin bits in the commensurate

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To induce intrinsic magnetism in the nominally nonmagnetic carbon materials containing only s and p electrons is an intriguing yet challenging task. Here, based on first-principles electronic structure calculations, we propose a universal approach inspired by Ovchinnikov's rule to guide us the design of a series of imaginative magnetic all-carbon structures. The idea is to combine the differently stacked graphene layers via the acetylenic linkages ( −C ≡ C − ) to obtain a class of two-dimensional (2D) and three-dimensional (3D) carbon networks. With first-principles electronic structure calculations, we confirm the effectiveness of this approach via concrete examples of double-layer ALBG-C 14 , triple-layer ALTG-C 22 , and bulk IALG-C 30 . We show that these materials are antiferromagnetic (AFM) semiconductors with intralayer Nél and interlayer AFM couplings. According to the above idea, our work not only provides a promising design scheme for magnetic all-carbon materials, but also can apply to other -bonding network systems.