Berlin 2008 – scientific programme

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O: Fachverband Oberflächenphysik

O 60: Symposium: Bimetallic Nanosystems: Tuning Physical and Chemical Properties I (Invited Speakers: Harald Brune, Michael Hilgendorff, Konstantin Neyman)

O 60.6: Talk

Thursday, February 28, 2008, 11:30–11:45, MA 005

Doping of monoatomic Cu chains with single Co atoms — •Christophe Nacci, Jérôme Lagoute, and Stefan Fölsch — Paul Drude Institute for Solid-State Electronics, Hausvogteiplatz 5-7, 10117 Berlin, Germany

Close-packed Co-Cu chains (interatomic spacing 255 pm) of various length and composition were assembled from single Co and Cu atoms on Cu(111) by atom manipulation in a low-temperature scanning tunneling microscope [1]. Co atoms can be attached to monoatomic Cu chains to terminate the structure but also incorporated into the chain to occupy a predefined site. Local spectroscopy reveals significant electronic Co-Cu coupling leading to confined quantum states delocalized along the heteroatomic chain. The quantum state densities of composite Co-Cu chains are modified compared to those of pure Cu chains [2]. The modifications are well reproduced by a simple tight-binding analysis. Co-Cu chains provide an interesting model case in which the quantum state of an atomic-scale host structure can be tuned by the controlled incorporation of foreign atoms.
J. Lagoute, C. Nacci, S. Fölsch, Phys. Rev. Lett. 98, 146804 (2007)
S. Fölsch, P. Hyldgaard, R. Koch, K. H. Ploog, Phys. Rev. Lett. 92, 56803 (2004)