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The nodal line semimetals have attracted much attention due to their uniquetopological electronic structure and exotic physical properties. A genuinenodal line semimetal is qualified by the presence of Dirac nodes along a linein the momentum space that are protected against the spin-orbit coupling. Inaddition, it requires that the Dirac points lie close to the Fermi levelallowing to dictate the macroscopic physical properties. Although the materialrealization of nodal line semimetals have been theoretically predicted innumerous compounds, only a few of them have been experimentally verified andthe realization of a genuine nodal line semimetal is particularly rare. Here wereport the realization of a genuine nodal line semimetal in LaSbTe. Weinvestigated the electronic structure of LaSbTe by band structure calculationsand angle-resolved photoemission (ARPES) measurements. Taking spin-orbitcoupling into account, our band structure calculations predict that a nodalline is formed in the boundary surface of the Brillouin zone which is robustand lies close to the Fermi level. The Dirac nodes along the X-R line inmomentum space are directly observed in our ARPES measurements and the energiesof these Dirac nodes are all close to the Fermi level. These results constituteclear evidence that LaSbTe is a genuine nodal line semimetal,providing a newplatform to explore for novel phenomena and possible applications associatedwith the nodal line semimetals.

Spectroscopic Evidence on Realization of a Genuine Topological Nodal Line Semimetal in LaSbTe