Dresden 2017 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 46: Ion and Electron Beam Induced Processes

DS 46.3: Vortrag

Freitag, 24. März 2017, 10:00–10:15, CHE 89

Ultrafast electronic response of graphene to a strong and localized electric field — •Richard A. Wilhelm1, Elisabeth Gruber2, Rémi Pétuya3, Roland Kozubek4, Bernhard C. Bayer5, Anke Hierzenberger4, Valerie Smejkal2, Florian Libisch2, Iñigo Adalzabal7, Andrey K. Kazansky3,8, Arkady Krasheninnikov1, Marika Schleberger4, Stefan Facsko1, Andrei G. Borisov6, Andres Arnau3,7, and Friedrich Aumayr21HZDR — 2TU Wien — 3DIPC, San Sebastian — 4Uni Duisburg-Essen — 5Uni Wien — 6CNRS, Paris — 7CFM, San Sebastian — 8IKERBASQUE, Bilbao

Ion transmission through thin solid films revealed many interesting properties of ion-solid interaction mechanisms, among them is ion equilibrium charge state and the ion stopping force. Using a well defined target such as free-standing graphene, ion transmission can also provide insights into processes occuring in the target material. Here we use slow highly charged ions and inverstigate their charge exchange and energy loss due to transmission through graphene. In a joint theoretical and experimental effort we find that large current densities of at least 1012 A/cm−2 are sustained by graphene without rupture, even though this current is only active for a few femtoseconds on a nm2 sized area, it’s value is about 3 orders of magnitude higher than established DC breakdown current densities. Our study shows that especially highly charged ions are well suited to investigate material properties under extreme conditions on a femtosecond time scale.

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