Dresden 2009 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 6: Electronic structure I

O 6.4: Vortrag

Montag, 23. März 2009, 12:00–12:15, SCH A216

Interplay between electronic states and structure during Au faceting — •Frederik Schiller¹, Martina Corso², Javier Cordón³, Javier García de Abajo⁴, and Enrique Ortega^1,2,3 — ¹Unidad de Física de Materiales CSIC/UPV, Manuel Lardizábal 3, E-20018 San Sebastián, Spain — ²DIPC, Manuel Lardizábal 4, E-20018 San Sebastián, Spain — ³Dpto. Física Aplicada I, Universidad del País Vasco, Plaza Oñate 2, E-20018 San Sebastián, Spain — ⁴Instituto de Óptica-CSIC, Serrano 121, E-28006 Madrid, Spain

Au(111) vicinal surfaces are characteristic examples of two-phase segregation or faceting. Between ∼ 4^∘ and 9.5^∘ miscut, the surface exhibits hill-and-valley structures formed by bunches of relatively wide (d_w∼ 36-41 Å) and narrow (d_n∼ 14 Å) terraces. The evolution of surface electronic states in such a faceted system is followed using a curved crystal. Beyond 4^∘ the surface state splits into distinct d_w and d_n bands. Our analysis suggests the crucial role of surface states in defining the characteristic d_w and d_n sizes during Au faceting.