Quasi-one-dimensional electronic state of alkali metal chains assembled on the surfaceV. Corradini1, 2, M. G. Betti3, C. Mariani2, 3, E. Spiller4 and L. Gavioli4
1 INFM, Dipartimento di Fisica, Università di Modena e Reggio Emilia via G. Campi 213/A, I-41100 Modena, Italy
2 INFM National Center on nanoStructures and bioSystems at Surfaces ( S3) via G. Campi 213/A, I-41100 Modena, Italy
3 INFM, Dipartimento di Fisica, Università di Roma "La Sapienza" Piazzale Aldo Moro 2, I-00185 Roma, Italy
4 INFM, Dipartimento di Matematica e Fisica, Università Cattolica del Sacro Cuore via dei Musei 41, I-25121 Brescia, Italy
received 16 April 2004; accepted in final form 25 August 2004
We investigate the electronic band dispersion associated to alkali metal chains assembled on the surface by angular-resolved photoelectron spectroscopy. The and atomic chains induce occupied electronic states with twofold symmetry and narrow bandwidth along the chain direction, showing a quasi-one-dimensional electronic character. The insulating character and the narrow bandwidth of the alkali-induced state suggest the relevance of electron correlation effects in the description of alkali-induced electronic-state dispersion.
73.20.-r - Electron states at surfaces and interfaces.
73.20.At - Surface states, band structure, electron density of states.
79.60.-i - Photoemission and photoelectron spectra.
© EDP Sciences 2004