  The surface atomic and electronic structure after deposition of 1/3 monolayer
(ML) Te on Cu(111) was determined using a combination of low-energy electron
diffraction (LEED), scanning tunneling microscopy and spectroscopy (STM/STS),
angle-resolved single and two-photon photoelectron spectroscopy (ARPES
/AR-2PPE) and density functional theory (DFT) calculations. Contrary to the
current state in literature Te does not create a two-dimensional surface alloy
but forms Cu$_2$Te$_2$ adsorbate chains in a $\left(2\sqrt{3} \times
\sqrt{3}\right)\textrm{R30}^\circ$ superstructure. We establish this by a
high-precision LEED-IV structural analysis with Pendry $R$ factor of $R =
0.099$ and corroborating DFT and STM results. The electronic structure of the
surface phase is dominated by an anisotropic downward dispersing state at the
Fermi energy $E_F$ and a more isotropic upward dispersing unoccupied state at
$E-E_F = + 1.43\,\textrm{eV}$. Both states coexist with bulk states of the
projected band structure and are therefore surface resonances.

Materials Science