Regensburg 2007 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 12: Nanostructures at Surfaces II (Wires, Tubes)
O 12.13: Vortrag
Montag, 26. März 2007, 17:15–17:30, H36
Electron wave-vector quantization in nanostructures — •Sebastian Wedekind1, Guillemin Rodary1, Dirk Sander1, Hui Liu2, Hongwu Zhao2, Larissa Niebergall1, Valeri Stepanyuk1, Patrick Bruno1, and Jürgen Kirschner1 — 1Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle/Saale, Germany — 2Institute of Physics, Chinese Academy of Science, Beijing, China
We use hexagonal vacancy islands on Cu(111) to study electron confinement in a nanostructure. Scanning tunneling microscopy shows that these monolayer deep depressions are often of almost perfect hexagonal shape and have a size of up to 24 nm. Low temperature scanning tunneling spectroscopy and ab initio based theory reveal electron wave-vector quantization due to electron confinement in the nanostructure. A Fourier transformation of the spatial modulation pattern of the local density of states (LDOS) indicates the quantization of the electron wave-vector within the nanostructure, which gives rise to a discontinuous, staircase-like dispersion relation. Our experimental and theoretical results show that each step of the dispersion relation corresponds to an extremum of the LDOS. The sequence of extrema identifies the complete eigenstate spectrum of the confined system.