## Three-dimensional nature of the band structure of ${\mathrm{ZrTe}}_{5}$ measured by high-momentum-resolution photoemission spectroscopy [3D nature ${\mathrm{ZrTe}}_{5}$ band structure measured by high-momentum-resolution photoemission spectroscopy]

Here, we have performed a systematic high-momentum-resolution photoemission study on ZrTe

_{5}using 6-eV photon energy. We have measured the band structure near the Γ point, and quantified the gap between the conduction and valence band as 18 ≤ Δ ≤ 29 meV. We have also observed photon-energy-dependent behavior attributed to final-state effects and the three-dimensional (3D) nature of the material's band structure. Our interpretation indicates the gap is intrinsic and reconciles discrepancies on the existence of a topological surface state reported by different studies. The existence of a gap suggests that ZrTe_{5}is not a 3D strong topologicalmore »
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