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Weyl semimetals are extremely interesting. Although the first Weyl semimetalwas recently discovered in TaAs, research progress is still significantlyhindered due to the lack of robust and ideal materials candidates. In order toobserve the many predicted exotic phenomena that arise from Weyl fermions, itis of critical importance to find robust and ideal Weyl semimetals, which havefewer Weyl nodes and more importantly whose Weyl nodes are well separated inmomentum space and are located close to the chemical potential in energy. Inthis paper, we propose by far the most robust and ideal Weyl semimetalcandidate in the inversion breaking, single crystalline compound tantalumsulfide Ta$_3$S$_2$ with new and novel properties beyond TaAs. We find thatTa$_3$S$_2$ has only 8 Weyl nodes, all of which have the same energy that ismerely 10 meV below the chemical potential. Crucially, our results show thatTa$_3$S$_2$ has the largest $k$-space separation between Weyl nodes among knownWeyl semimetal candidates, which is about twice larger than TaAs and twentytimes larger than the predicted value in WTe$_2$. Moreover, we predict thatincreasing the lattice by $<4\%$ can annihilate all Weyl nodes, driving a noveltopological metal-to-insulator transition from a Weyl semimetal state to atopological insulator state. We further discover that changing the latticeconstant can move the Weyl nodes and the van Hove singularities with enhanceddensity of states to the chemical potential. Our prediction provides acritically needed robust candidate for this rapidly developing field. The wellseparated Weyl nodes, the topological metal-to-insulator transition and theremarkable tunabilities suggest Ta$_3$S$_2$'s potential as the ideal platformin future device-applications based on Weyl semimetals.

A strongly robust Weyl fermion semimetal state in Ta$_{3}$S$_{2}$