Localization of surface states in disordered step lattices

2020-02-14 22:42:31

Cu state surface Phys states

责任者: Baumberger, F.;Hengsberger, M.;Muntwiler, M.;Shi, M.;Krempasky, J.;Patthey, L.;Osterwalder, J.;Greber, T. 单位: Phys.institut der Univ. Zurich, Switzerland 来源出处: Physical Review Letters(Phys. Rev. Lett. (USA)),2004/05/14,92(19):196805-1 摘要: The character of the surface state wave function on regularly stepped Cu(111) is reinvestigated. It is shown that the qualitative change at terrace lengths around 17 Å observed previously by Ortega et al. [Phys. Rev. Lett. 84, 6110 (2000)] must necessarily be described as a change from a propagating superlattice state to a terrace-confined quasi-one-dimensional state. This reconciles previous, apparently contradictory experimental results and sheds new light on the behavior of nearly free electrons in nanostructures. Possible mechanisms driving the localization are discussed on the basis of the surface state bulk penetration depth, which has been measured in both regimes 关键词: copper;localised states;surface states;surface structure;X-ray photoelectron spectra;surface states;disordered step lattices;localised states;surface state wave function;terrace lengths;propagating superlattice state;nearly free electrons;state bulk penetration depth;regularly stepped Cu(111);Cu