CuTe chains on Cu(111) by deposition of 1/3 ML Te: atomic and electronic structure

Abstract

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 $\left(2\sqrt{3}\times \sqrt{3}\right){\text{R30}}^{\circ }$ 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 $E-E_F=+1.43\text{eV}$. Both states coexist with bulk states of the projected band structure and are therefore surface resonances.

References in corpus (5)

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• Growth and crystallographic structure of TiTe${}_2$ on Au(111): From sub-monolayer structures to single- and multi-layer films