Observation of new surface states on Cu(110) with the use of angle-resolved photoelectron spectroscopy

Publisher Website
Google Scholar
Abstract
Angle-resolved photoemission investigations of the Cu(110) surface reveal the existence of surface states along the \ensuremath{\Sigma}\bar\else\textasciimacron\fi{} line of the two-dimensional Brillouin zone. Midway between the \ensuremath{\Gamma}\bar\else\textasciimacron\fi{} and X\bar\else\textasciimacron\fi{} symmetry points they are located above the tops of the \ensuremath{\Sigma}${\bar\else\textasciimacron\fi{}}_{1}$ and \ensuremath{\Sigma}${\bar\else\textasciimacron\fi{}}_{2}$ symmetry subbands of the occupied d states and run out of the gaps on the way to \ensuremath{\Gamma}\bar\else\textasciimacron\fi{} and X\bar\else\textasciimacron\fi{}, respectively, and become resonances. Their band dispersions and symmetry characters have been measured, and are compared with a second-principles, fully relativistic calculation of the bulk continuum. The observed surface states are not predicted by existing calculations of the surface electronic structure.