Surface resonances and reduced symmetry in the heteroepitaxial Ag/Cu(110) system

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Submonolayer coverages (∼0.65 ML) of Ag vapor deposited on Cu(110) are studied using synchrotron-based photoelectron spectroscopy and scanning tunneling microscopy (STM). Induced surface resonances, or modified bulk states, have been observed that are derived from Cu bulk bands of Σ3 and Σ4 character. These resonances are observed in photoemission geometries that forbid their detection assuming they have the symmetry character of the states from which they are derived. Based on this and the surface morphology as determined by STM, the symmetry of the surface is found to be sufficiently reduced, allowing for hybridization between the Ag sp and Cu d bands. This hybridization is the origin for the modification of the Cu bands near the surface, and the reduction in symmetry allows for the observation of these resonances regardless of the photoemission geometry.

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Physical Review B - Condensed Matter and Materials Physics

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