Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 53: Nanostructures at surfaces: Dots, particles, clusters III
O 53.4: Vortrag
Donnerstag, 26. März 2009, 15:45–16:00, SCH A215
Effect of confined surface electrons on atomic motion on nanoislands — •Larissa Niebergall1, Alexey S. Smirnov2,3, Nikolay N. Negulyaev2, Wolfram Hergert2, Alexander M. Saletsky3, and Valeri S. Stepanyuk1 — 1Max Planck Institute of Microstructure Physics, 06120 Halle, Germany — 2Physics Department, Martin-Luther-University, 06099 Halle, Germany — 3Faculty of Physics, Moscow State University, 119899 Moscow, Russia
Several fascinating phenomena occur if surface electrons are confined to closed nanostructures [1-3]. The first experimental investigation of the quantum confinement of surface electrons on nanoscale islands on (111) noble metal surfaces by means of STM has been performed by Li et al. [3]. These studies revealed the validity of the confinement picture down to the smallest of island sizes. Here, the quantum confinement of surface electrons on top of nanoscale islands and around them is studied by means of the first-principles Korringa-Kohn-Rostocker Greens function method [4]. Our kinetic Monte Carlo simulations reveal that confinement-induced electronic states around and on top of nanoislands significantly affect atomic diffusion [4]. Formation of empty zones and orbits of adatom motion is shown. We demonstrate that the quantum confinement dramatically influences the growth process of nanoislands at low temperatures [4].
1. N. N. Negulyaev et al., Phys. Rev. Lett. 101, 226601 (2008)
2. V. S. Stepanyuk et al., New J. Phys. 9, 388 (2007)
3. J. Li et al., Phys. Rev. Lett. 80, 3332 (1998)
4. A. S. Smirnov et al., Phys. Rev. B 78 041505R (2008)