We present a comprehensive study of electric field effects upon the photoluminescence of individual quantum dot molecules. Using p-i-n diode structures, we are able to observe neutral, negatively and positively charged excitons, and biexcitons in a single device. Each molecule shows an extremely rich line structure which can be accurately described with a simple model. Moreover, reversing the doping sequence allows both electron and hole coupling between the dots to be investigated. High potential barriers cladding the quantum dot molecule allow the application of strong electric fields, resulting in a larger than expected quantum confined Stark effect.
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See supplementary material at http://dx.doi.org/10.1063/1.3652766 for the QDM Hamiltonians under an electric field for the biexciton state and the positively and negatively charged exciton states, accounting for spinconserving hole tunneling, exchange and Coulomb interactions, Pauli exclusion and the parabolic quantum confined Stark effect.
© 2011 American Institute of Physics.
2011
American Institute of Physics
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