Regensburg 2013 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 102: Quantum dots and wires: Transport

HL 102.7: Talk

Friday, March 15, 2013, 12:45–13:00, H13

Ultrafast photocurrents and THz generation in single InAs-nanowires — •Nadine Erhard¹, Paul Seifert¹, Leonhard Prechtel¹, Simon Hertenberger¹, Helmut Karl², Gerhard Abstreiter¹, Gregor Koblmüller¹, and Alexander W. Holleitner¹ — ¹Walter Schottky Institut, TU München, 85748 Garching, Germany — ²Institute of Physics, University of Augsburg, 86135 Augsburg, Germany

We apply a recently developed pump-probe photocurrent spectroscopy to clarify the ultrafast temporal interplay of the different photocurrent mechanisms occurring in single InAs-nanowire-based circuits with a picosecond time-resolution [1]. The data are interpreted in terms of a photo-thermoelectric current and the transport of photogenerated holes to the electrodes as the dominating ultrafast photocurrent contributions. Moreover, THz radiation is generated in the optically excited InAs-nanowires, which is interpreted in terms of a dominating photo-Dember effect [2]. The results are relevant for nanowire-based optoelectronic and photovoltaic applications as well as for the design of nanowire-based THz sources. Financial support by the ERC-grant NanoREAL is acknowledged.

• [1] L. Prechtel, M. Padilla, N. Erhard, H. Karl, G. Abstreiter, A. Fontcuberta i Morral, and A. W. Holleitner, Nano Lett. 12, 2337 (2012).
• [2] Nadine Erhard et al., Annalen der Physik (2013).