Regensburg 2013 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 28: Poster Session: Graphen; Transport properties; Transport in high magnetic fields / Quantum Hall effect; Metal-semiconductor hybrid systems

HL 28.8: Poster

Montag, 11. März 2013, 16:00–20:00, Poster A

Ultrafast photocurrents of monolayer graphene on sapphire — •Martin Schwarz, Andreas Brenneis, Max Seifert, Jose Garrido, and Alexander Holleitner — Walter Schottky Institut and Physik-Department, TU München, 85748 Garching, Germany

We present picosecond-time resolved optoelectronic measurements of monolayer graphene, grown by chemical vapor deposition (CVD), on sapphire substrates. Our optoelectronic on-chip scheme samples the photocurrents within the graphene with a picosecond time resolution [1]. We verify an ultrafast displacement current at the metal-graphene interfaces and the dynamics of hot charge carriers within the graphene. In particular, we compare our results to the ones of freely suspended bilayer graphene with special emphasis on the thermal coupling of the graphene to its environment. Financial support by the ERC-grant NanoREAL is acknowledged.

• [1] L. Prechtel, L. Song, D. Schuh, P. Ajayan, W. Wegscheider, A.W. Holleitner, Nature Comm. 3, 646 (2012).