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The discovery of archetypal two-dimensional (2D) materials provides enormousopportunities in both fundamental breakthroughs and device applications, asevident by the research booming in graphene, atomically thin transition-metalchalcogenides, and few-layer black phosphorous in the past decade. Here, wereport a new, large family of semiconducting dialkali-metal monochalcogenides(DMMCs) with an inherent A$_{2}$X monolayer structure, in which two alkalisub-monolayers form hexagonal close packing and sandwich the triangularchalcogen atomic plane. Such unique lattice structure leads to extraordinaryphysical properties, such as good dynamical and thermal stability, visible tonear-infrared light energy gap, high electron mobility (e.g. $1.87\times10^{4}$cm$^{2}$V$^{-1}$S$^{-1}$ in K$_{2}$O). Most strikingly, DMMC monolayers (MLs)host extended van Hove singularities near the valence band (VB) edge, which canbe readily accessed by moderate hole doping of $\sim1.0\times10^{13}$cm$^{-2}$. Once the critical points are reached, DMMC MLs undergo spontaneousferromagnetic transition when the top VBs become fully spin-polarized by strongexchange interactions. Such gate tunable magnetism in DMMC MLs are promisingfor exploring novel device concepts in spintronics, electronics andoptoelectronics.

Dialkali-Metal Monochalcogenide Semiconductors with High Mobility and Tunable Magnetism