Berlin 2012 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 60: Graphene: Raman Spectroscopy

HL 60.5: Vortrag

Mittwoch, 28. März 2012, 16:30–16:45, ER 164

Interlayer coupling in graphene — •Felix Herziger, Patrick May, and Janina Maultzsch — Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany

Raman spectroscopy has reveiled itself as a very versatile tool to investigate the properties of graphene. It is often used to distinguish a monolayer region from regions with more layers by the shape of the 2D band. Without optical contrast or topography measurements, this method is only reliable for layer number identification up to three layers.

Here we report Raman measurements of interlayer vibrational modes in graphene layers with varying thickness. These modes show a clear dependence on the number of graphene layers due to interlayer coupling. Therefore, Raman measurements can be used to identify the number of graphene layers and additionally investigate the interlayer interactions. For more than two layers, the distinction between the number of layers using interlayer modes can be more precise than the usual approach of analyzing the 2D mode.