Browsing by Author "Krauß, Benjamin"

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    Scanning probe spectroscopy of graphene nanostructures
    (2012) Krauß, Benjamin; Klitzing, Klaus von (Prof. Dr.)
    The aim of the present thesis is to shed some light on different properties of graphene, a single atomic layer of carbon atoms. Since the discovery of an easy way to fabricate graphene from graphite by exfoliation in 2004, a huge increase in graphene related research occurred and led to the new research field of ultra-relativistic condensed matter physics. The impact of graphene in fundamental research as well as applications in nanoelectronics steadily increases. In the framework of this thesis we focus on scanning probe spectroscopy methods to study this truly two-dimensional material. Hereby we take advantage of the fact, that graphene and its two-dimensional electron gas is readily accessible at the surface and not buried in a bulk material. The two main methods, scanning confocal Raman spectroscopy and scanning single-electron transistor microscopy, allow to determine such different information like the interaction strength between phonons and charge carriers, the chirality of the graphene edge or the consequences of interactions between electrons. The cornucopia of extractable information from Raman spectroscopy results mainly from the resonance mechanism, linking electronic with phononic properties. The interest in single-electron transistors as a local probe is based on its extraordinary high sensitivity to electrostatic potentials.