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Recently, a family of nonmagnetic kagome metals \textit{A}$\mathrm{V_3Sb_5}$(\textit{A}=K, Rb, and Cs) has attracted significant attention for realizingthe intertwining of quantum order and nontrivial topology. However, thesecompounds have been identified to host complex band structures. Therefore, itis desirable to design and synthesize novel kagome materials with a simple bandtopology and good transport properties. In this study, using first-principlescalculations, we present the electronic properties and the intrinsic spin Halleffect of V$_6$Sb$_4$, the latest experimentally synthesized vanadium-basedcompounds with a kagome bilayer. In the absence of spin-orbital coupling (SOC),this compound is a Dirac nodal line semimetal with symmetry-protected nodalrings near the Fermi level. Within the SOC, the spin-rotation symmetry breaksthe gaps of the nodal rings with a small band gap. Furthermore, based on theWannier tight-binding approach and the Kubo formula, we propose a large spinHall effect in V$_6$Sb$_4$, which intrinsically originates from the spin Berrycurvature. Our work further expands nonmagnetic kagome compounds forapplications in spintronics accompanied by exotic quantum order.

Symmetry-protected Dirac nodal lines and large spin Hall effect in $\mathbf{V_6Sb_4}$ with kagome bilayer