Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 30: Poster: Quantum dots and wires: Preparation, characterization, optical properties and transport

HL 30.15: Poster

Montag, 31. März 2014, 17:00–20:00, P2

All optical approach to determine the spatial extension of bound wave functions in semiconductor quantum dots using intraband spectroscopy — •Sandra Kuhn, Judith Specht, Andreas Knorr, and Marten Richter — Institut für Theoretische Physik, Nichtlineare Optik und Quantenelektronik, Technische Universität Berlin, Hardenbergstrasse 36, 10623 Berlin, Germany

Self-assembled semiconductor quantum dots are one of the most extensively studied nanostructures and a variety of applications are based on them. High quality devices require precise information about the structural quantum dot properties, especially about the quantum dot shape and size. However, sophisticated experimental methods such as electron microscopy to identify the quantum dot size have several significant drawbacks.

We propose an all optical spectroscopic pump-probe method to determine the spatial extension of nanoscale electron wave functions in semiconductor quantum dots. In particular, we use intraband transitions between unbound continuum states in the host medium and the bound states to adress the extension of the quantum dot wave function. The developed theoretical scheme is readily applicable to quantum dots embedded in bulk material and can be applied to quantum dots embedded in two dimensional host materials as well with slight modifications. We present an analytical and easy to use formula to extract information about the spatial extension of bound quantum dot states from pump-probe experiments.