Abstract
Dispersion of quantum well (QW) states of $\mathrm{Ag}∕\mathrm{W}(110)$ was investigated by angle-resolved photoemission and compared with results of layer Korringa-Kohn-Rostoker calculations. Energy crossings of QW and substrate bands of the same symmetry lead to the formation of broad hybridization gaps in the QW bands around the $\mathbf{k}$ points of the crossings. A symmetry analysis of the electronic bands in the Ag monolayer and the W substrate suggests that respective gaps may generally be taken as a fingerprint for the interaction with substrate states of even parity with respect to the emission plane. Providing information on site-specific localization of electron densities, the parity data are of high importance to understand quasiparticle interactions in solids.
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