Multidimensional multiphoton momentum microscopy of the anisotropic Ag(110) surface
Andi Li, Marcel Reutzel, Zehua Wang, David R. Schmitt, Marius Keunecke, Wiebke Bennecke, G. S. Matthijs Jansen, Daniel Steil, Sabine Steil, Dino Novko, B. Gumhalter, Stefan Mathias, Hrvoje Petek
Abstract
Silver mirrors reflect light naturally because no discrete optical transitions modify their spectra. Yet, nonlinear spectroscopy has gleaned the electronic bands and collective responses from its most stable Ag(111) surface. (110) surfaces, whose band structure is hardly explored, form at intersections of two proximate (111) surfaces. This union creates new anisotropic bands whose three-dimensional energy-\ensuremath{\mathit{k}}${}_{\ensuremath{\parallel}}$ structures are investigated by powerful two-photon photoemission momentum spectromicroscopy. The spectra reveal how novel properties arise when bands of proximate surfaces collide.