Regensburg 2007 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 30: Nanostructures at Surfaces III (Dots, Particles, Clusters)

O 30.3: Vortrag

Dienstag, 27. März 2007, 16:15–16:30, H36

Quantum Confinement of Surface-State Electrons in Atomic-Scale Nanostructures — •L. Niebergall, V. S. Stepanyuk, and P. Bruno — Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, 06120, Germany

Surface-state electrons on (111) noble metal surfaces form a two-dimensional (2D) nearly free electron gas. Particularly fascinating phenomena occur if the surface electrons are confined to closed structures (quantum corrals, nanoislands, vacancy holes). Such structures can be considered as quantum resonators for surface-state electrons. We present the state of the art ab initio studies of quantum mirages and magnetic interactions in atomic-scale nanostructures [1]. We show that the spin-polarization of surface-state electrons can be projected to a remote location by quantum states of resonators. We find that the spin-polarization of surface-state electrons on transition metal surfaces can be manipulated by exploiting the quantum confinement of electrons [2]. Adatom self-organization induced by quantum confinement of surface electrons is demonstrated [3].

1. V.S. Stepanyuk, L. Niebergall, W. Hergert, P. Bruno, Phys. Rev. Lett. 94, 187201 (2005).

2. L. Niebergall, V. S. Stepanyuk, J. Berakdar, P. Bruno, Phys. Rev. Lett. 96, 127204 (2006).

3. V.S. Stepanyuk, N.N. Negulyaev, L. Niebergall, R. Longo, P. Bruno, Phys. Rev. Lett. 97, 186403 (2006).