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Topological nodal-line semimetals are always characterized by the drumheadsurface states at the open boundaries. In this paper we first derive ananalytical expression for the surface Green's function of a nodal-linesemimetal. By making use of this result, we explore the charge and spintransport properties of a metallic chain on the surface of a nodal-linesemimetal, as functions of the gate voltage applied on the top of the material.According to the size of the nodal loop, due to the coupling to the surfacemodes, the charge conductance in the chain is found to show a robust plateau at$e^{2}/h$, or to exhibit multiple valleys at $e^{2}/h$. Correspondingly, thespin polarization of the transmitted current is $100\%$ at the plateau region,or exhibits multiple peaks at nearly $100\%$. This feature can be viewed as atransport signature of the topological nodal-line semimetals.

Quantum Transport on the Surfaces of Topological Nodal-line Semimetals