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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. Kazansky^3,8, Arkady Krasheninnikov¹, Marika Schleberger⁴, Stefan Facsko¹, Andrei G. Borisov⁶, Andres Arnau^3,7, and Friedrich Aumayr² — ¹HZDR — 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.