A theoretical analysis of quantum mirages on a Cu(1 1 1) surface

Employing the Newns–Anderson model to describe a Co adatom placed at one focus of an elliptical quantum corral on a Cu(1 1 1) surface, we theoretically investigate the mechanism behind how so-called quantum mirages could be observed at the opposite empty focus. First, we try reproducing the experimental results of the differential conductance dI/dV spectra measured at the empty focus, which exhibit features very similar to those measured at the Co-occupied focus. Furthermore, we consider the temperature dependence of the dI/dV spectra at the two foci. Finally, we consider the structure of the dI/dV spectra when the STM tip is placed very close to the Co adatom (at the Co-occupied focus) and a metal surface (at the empty focus).