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TaTe$_4$ is a quasi-1D tetrachalcogenide that exhibits a CDW instabilitycaused by a periodic lattice distortion. Recently, pressure-inducedsuperconductivity has been achieved in this compound, revealing a competitionbetween these different ground states and making TaTe$_4$ very interesting forfundamental studies. Although TaTe$_4$ exhibits CDW ordering below 475 K,transport experiments have reported metallic behavior with a resistivityplateau at temperatures lower than 10 K. In this paper, we study the electronicstructure of TaTe$_4$ using a combination of high-resolution angle-resolvedphotoemission spectroscopy and density functional calculations. Our resultsreveal the existence of the long-sought metallic states. These states exhibitmixed dimensionality, while some of them might have potential topologicalproperties.

Experimental observation of metallic states with different dimensionality in a quasi-1D charge density wave compound