Abstract
We have investigated the charging of conduction as well as the valence band states of InAs quantum dots by magneto capacitance voltage spectroscopy. Whereas measurements in magnetic fields perpendicular to the base plane of the quantum dots reveal the dispersion of the single particle levels and help to identify the corresponding charging peaks, measurements in parallel magnetic fields allow the mapping of the momentum space wave functions corresponding to the individual charging peaks. The wave function maps directly visualize anisotropies in the confinement potential. For electrons, a sequential filling of a shell-like energy level structure is observed and the results can be explained well by using a harmonic approximation for the lateral confinement potential and a single effective mass. For holes, the charging behaviour is more complicated. The dispersion measurements in conjunctions with wave function maps show that the orbital angular momentum cannot be treated as good quantum number and more complex theories have to be used. Electron as well as hole wave function reveal an anisotropy in the confinement potential with the low energy axis along the [0–11] direction.
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Reuter, D. (2008). Momentum Space Wave Functions in InAs Quantum Dots Mapped by Capacitance Voltage Spectroscopy. In: Haug, R. (eds) Advances in Solid State Physics. Advances in Solid State Physics, vol 47. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-74325-5_4
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DOI: https://doi.org/10.1007/978-3-540-74325-5_4
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