Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 52: Quantum wires: Optical properties (with TT)

HL 52.4: Vortrag

Dienstag, 1. April 2014, 15:15–15:30, POT 112

Picosecond time-resolved photocurrents in single semiconductor nanowires — •Stefan Zenger1,2, Nadine Erhard1, and Alexander Holleitner11Walter Schottky Institute and Physik-Department, Technische Universität München, Germany — 2stefan.zenger@wsi.tum.de

Conventional scanning photocurrent microscopy experiments on semiconductor nanowires are typically limited to timescales exceeding several tens of picoseconds. Yet, it is known from optical experiments that carrier relaxation and transport processes can occur on much faster timescales in semiconducting nanowires. We apply a recently developed pump-probe photocurrent spectroscopy to investigate the photocurrent dynamics in single nanowires made out semiconductors, such as InAs, GaAs, and InGaN, with an on-chip THz-time domain spectroscopy [1]. Hereby, the ultrafast photocurrent response of the nanowire is sampled at a field probe in a stripline circuit a picosecond time-resolution. We discuss ultrafast thermoelectric, displacement, and carrier lifetime limited currents as well as the time-resolved transport of photogenerated holes.

[1] N. Erhard, P. Seifert, L. Prechtel, S. Hertenberger, H. Karl, G. Abstreiter, G. Kobelmueller,and A. Holleitner, Ann. Phys. (Berlin) 525, 180 (2013).

We gratefully acknowledge financial support from the ERC-grant NanoREAL.

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