Martin-Luther-Universität Halle-Wittenberg


Manuela Bank-Zillmann

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Jacek Goniakowski: Nano-polarity: electrostatic effects in free and supported nano-objects

Termin Donnerstag, 15. Dezember 2016, 17.15 - 18.30 Uhr
Veranstaltungsart Kolloquium
Einrichtung Naturwissenschaftliche Fakultät II
Veranstalter Institut für Physik / SFB 762
Veranstaltungsort Leibniz-Institut für Agrarentwicklung in Transformationsökonomien
Straße Theodor-Lieser-Str. 2
PLZ/Ort 06120 Halle (Saale)
Ansprechpartner Michael Strauch
Telefon +49 345-5525449


The advances in the fabrication and control of ultra-thin oxide films have fostered the development of theoretical concepts related to confinement and low dimensionality effects in these objects. This concerns in particular the electrostatically-driven polarity effects, which appear to have a sound influence on the stability and properties of ultra-thin films, 2D ribbons, or nano-islands. Indeed, below a critical size, nano-objects may sustain finite dipole moments which drive strongly size- and dimensionalitydependent properties. At small sizes, polarity effects may
also extend beyond the surface region and drive structural transformations of the entire object, resulting in novel structures, with no bulk counterparts. Finally, since oxide nano-objects are often synthesized on metal substrates, their characteristics are additionally modified by the electrostatic coupling between their structure and the interface charge transfer.

Relying on selected examples which were the subject of recent experimental and/or theoretical works, we will exemplify such novel manifestations of polarity in free and supported nano-scale oxide films and discuss the consequences for their physico-chemical properties.



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