Quasi-one-dimensional metallic band dispersion in the commensurate charge density wave of $\mathrm{1T−TaS_{2}}$

Physical review / B 96(19), 195147 (2017). doi:10.1103/PhysRevB.96.195147
The commensurate charge-density wave (CDW) in the layered compound $\mathrm{1T−TaS_{2}}$ has hitherto mostly been treated as a quasi-two-dimensional phenomenon. Recent band structure calculations have, however, predicted that the CDW coexists with a nearly one-dimensional metallic dispersion perpendicular to the crystal planes. Using synchrotron radiation-based angle-resolved photoemission spectroscopy, we show that this metallic band does in fact exist. Its occupied band width is in excellent agreement with predictions for a simple $τ_c$ stacking order of the CDW between adjacent layers, and its periodicity in the c direction is $2π/c$.
Published by APS, Woodbury, NY