Heidelberg 2015 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 62: Poster: Quantum Optics and Photonics III

Q 62.96: Poster

Thursday, March 26, 2015, 17:00–19:00, C/Foyer

Laser-driven current through graphene-nanogap tunnel junctions — •Christian Heide, Takuya Higuchi, Andreas Artinger, Konrad Ullmann, Heiko B. Weber, and Peter Hommelhoff — Department Physik, Friedrich-Alexander-Universität Erlangen-Nürnberg

When a nanometer-scale gap is formed between two conducting nanostructures, the quantum tunneling of electrons dominates the transport properties of the junction, providing unique opportunities in electronics such as tunnel diodes. Recently, steering of the electron tunneling process by the electric field of few-cycle femtosecond laser pulses was demonstrated at the surface of a metal nanotip [1]. In this presentation, we show first results on the transport properties of graphene nanogap tunneling junctions under illumination of few-cycle laser pulses, where a similar laser-field-driven tunneling is expected. We observed an increase in the tunneling current through the nanogap under the laser illumination, which can be regarded as photon-assisted tunneling process.

[1] M. Krüger, M. Schenk and P. Hommelhoff, Nature 475, 78- 81(2011).