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Lifshitz transition across the Ag/Cu(111) superlattice band gap tuned by interface doping

AuthorsAbd El-Fattah, Z. M. ; Matena, Manfred; Corso, Martina ; García de Abajo, Francisco Javier ; Schiller, Frederik ; Ortega, J. Enrique
Issue Date2011
PublisherAmerican Physical Society
CitationPhysical Review Letters 107(6): 066803 (2011)
AbstractThe two-dimensional, free-electron-like band structure of noble metal surfaces can be radically transformed by appropriate nanostructuration. A case example is the triangular dislocation network that characterizes the epitaxial Ag/Cu(111) system, which exhibits a highly featured band topology with a full band gap above EF and a hole-pocket-like Fermi surface. Here we show that controlled doping of the Ag/Cu(111) interface with Au allows one to observe a complete Lifshitz transition at 300 K; i.e., the hole pockets fill up, the band gap entirely shifts across EF, and the Fermi surface becomes electron-pocket-like.
Description5 páginas, 4 figuras.-- PACS numbers: 73.20.At, 73.22.-f, 79.60.Jv
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevLett.107.066803
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