Single-particle-picture breakdown in laterally weakly confining GaAs quantum dots

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Authors	HUBER Daniel LEHNER Barbara Ursula CSONTOSOVÁ Diana REINDL Marcus SCHULER Simon COVRE DA SILVA Saimon Filipe KLENOVSKÝ Petr RASTELLI Armando
Year of publication	2019
Type	Article in Periodical
Magazine / Source	Physical Review B
MU Faculty or unit	Faculty of Science
Citation
Web	https://journals.aps.org/prb/abstract/10.1103/PhysRevB.100.235425
Doi	http://dx.doi.org/10.1103/PhysRevB.100.235425
Keywords	quantum dots; magnetic field; configuration interaction
Description	We present a detailed investigation of different excitonic states weakly confined in single GaAs/AlGaAs quantum dots obtained by the Al droplet-etching method. For our analysis we make use of temperature-, polarization-, and magnetic-field-dependent u-photoluminescence measurements, which allow us to identify different excited states of the quantum dot system. Besides that, we present a comprehensive analysis of g-factors and diamagnetic coefficients of charged and neutral excitonic states in Voigt and Faraday configuration. Supported by theoretical calculations by the configuration-interaction method, we show that the widely used single-particle Zeeman Hamiltonian cannot be used to extract reliable values of the g-factors of the constituent particles from excitonic transition measurements.
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