Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 66: Electronic Structure of Surfaces
O 66.3: Poster
Mittwoch, 18. März 2015, 18:15–21:00, Poster A
Force and Kelvin Probe Measurements on Confined Electronic States inside Quantum Resonators — •Fabian Queck1, Florian Albrecht1, Alastair McLean2, and Jascha Repp1 — 1Institute of Experimental and Applied Physics, University of Regensburg, 93053 Regensburg, Germany — 2Department of Physics, Engineering Physics and Astronomy, Queen's University, Kingston, Ontario, Canada, K7L 3N6
On closed-packed surfaces of noble metals such as Cu(111) surface state electrons form a nearly free electron gas in two dimensions. The electrons are scattered from step-edges, point defects and adsorbates giving rise to standing wave patterns, which can be engineered by so-called quantum corrals [1]. The standing wave patterns gives rise to long range interactions between adsorbates [2] and should therefore be associated with measurable forces between scatterers.
Here we make an attempt to directly measure these forces with atomic force microscopy and to measure the possible changes of the local contact potential difference generate by the modulation of the surface local density of states associated with the standing wave patterns.
[1] M. F. Crommie, C. P. Lutz, and D. M. Eigler. Confinement of Electrons to Quantum Corrals on a Metal Surface. Science, 262(5131), 218-220, 1993.
[2] J. Repp. Rastertunnelmikroskopie und -spektroskopie an Adsorbaten auf Metall und Isolatoroberflaechen. PhD thesis, Freie Universitaet Berlin, 2002.