Berlin 2005 – wissenschaftliches Programm

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O: Oberflächenphysik

O 32: Nanostrukturen III

O 32.2: Vortrag

Montag, 7. März 2005, 11:00–11:15, TU EB202

Kinks and junctions in assembled Cu/Cu(111) quantum wires studied by low-temperature scanning tunneling microscopy and spectroscopy — •Jérôme Lagoute, Xi Liu, and Stefan Fölsch — Paul-Drude-Institut für Festkörperelektronik, Hausvogteiplatz 5-7, D-10117 Berlin

Low-temperature STM-based atomic manipulation at 7 K was used to construct kinks and junctions in monatomic Cu chains on Cu(111). The juncture of these structures is stabilized by a compact Cu trimer while the extremities consist of close-packed monatomic Cu chains along the in-plane ⟨110⟩ directions (Cu-Cu spacing 255 pm). Starting from the fact that straight Cu/Cu(111) chains exhibit chain-localized quantum states, we have studied the local density of states (LDOS) of these structures of advanced complexity by spatially mapping the dI/dV signal at constant tip height. We find that the LDOS and the eigenstate energies of kinked and branched wires are well described by the LCAO (local combination of atomic orbitals) approach. The wave function confinement in these structures and the electronic implications of the juncture will be discussed in detail.