Regensburg 2007 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 13: Poster 1

HL 13.41: Poster

Monday, March 26, 2007, 15:00–17:30, Poster A

From a gate voltage scale to an energy scale in capacitance voltage spectroscopy of InAs quantum dots — •Arne Ludwig, Dirk Reuter, and Andreas D. Wieck — Lehrstuhl für angewandte Festkörperphysik, Ruhr-Universität Bochum, D-44780 Bochum

Self-assembled InAs quantum dots can be investigated by capacitance voltage (C-V) spectroscopy to obtain an addition spectra of bound states. To extract quantization and interaction energies from the measurement, the gate voltage scales have to be converted to an energy scale. In literature, different approaches are used, mainly based on a simple geometric lever arm law.

In this contribution, we will apply different methods to C-V measurements on high quality n- as well as p-type samples and compare the results. Especially, for the first time we try to take the band bending due to the charge on the quantum dots into account. By doing so, we find -compared to lever arm method- smaller values for the relevant energies.