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Does the size of atoms present a lower limit to the size of electronicstructures that can be fabricated in solids? This limit can be overcome byusing devices that exploit quantum mechanical scattering of electron waves atatoms arranged in focussing geometries on selected surfaces. Calculationsreveal that features smaller than a hydrogen atom can be obtained. Thesestructures are potentially useful for device applications and offer a route tothe fabrication of ultrafine and well defined tips for scanning tunnelingmicroscopy.Comment: 4 pages, 4 figure

Focusing quantum states on surfaces: A route towards the design of ultrasmall electronic devices