  We report the electronic structure of CuTe with a high charge density wave
(CDW) transition temperature Tc = 335 K by angle-resolved photoemission
spectroscopy (ARPES). An anisotropic charge density wave gap with a maximum
value of 190 meV is observed in the quasi-one-dimensional band formed by Te px
orbitals. The CDW gap can be filled by increasing temperature or electron
doping through in situ potassium deposition. Combining the experimental results
with calculated electron scattering susceptibility and phonon dispersion, we
suggest that both Fermi surface nesting and electron-phonon coupling play
important roles in the emergence of the CDW.
