Berlin 2008 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 14: Electronic Properties I

MM 14.3: Vortrag

Montag, 25. Februar 2008, 17:15–17:30, H 0111

Parity of substrate bands probed by quantum-well states of overlayer — •Denis Vyalikh¹, Yuriy Kucherenko², Frederik Schiller³, Matthias Holder¹, Andreas Kade¹, Serguei Molodtsov¹, and Clemens Laubschat¹ — ¹Institut für Festkörperphysik, Technische Universität Dresden, D-01062 Dresden, Germany — ²Institute of Metal Physics, National Academy of Sciences of Ukraine, UA-03142 Kiev, Ukraine — ³Departamento de Fisica de Materiales, Universidad del Pais Vasco, E-20018 Spain

Quantum-well (QW) states in metallic nanostructures are objects of continued interest and exhibit permanently novel fascinating phenomena. In the present contribution we demonstrate by means of by angle-resolved photoelectron spectroscopy (ARPES) study of Ag/W(110)supported by Layer Korringa-Kohn-Rostoker (LKKR) calculations that energy overlap of QW and substrate bands of the same parity lead to the formation of broad hybridization gaps around the k-point of the crossings. Since the symmetry properties of two-dimensional QW bands can easily be determined, they can successfully be used as fingerprints to probe parity of substrate bands. The parity data provide information about site-specific localization of electron densities that may be used, e.g. to understand interactions in correlated materials like high-temperature superconductors electron-phonon coupling) or heavy-fermion systems ( f-d hybridization). References: 1) D. V. Vyalikh et al., Phys. Rev. B 76, 153406 (2007).