Optical study of electron-electron exchange interaction in CdTe/ZnTe quantum dots

Abstract

We present an experimental study of electron-electron exchange interaction in self-assembled CdTe/ZnTe quantum dots based on the photoluminescence measurements. The character and strength of this interaction are obtained by simultaneous observation of various recombination channels of a doubly negatively charged exciton, including previously unrecognized emission lines related to the electron-singlet configuration in the final state. A typical value of the electron singlet-triplet splitting, which corresponds to the exchange integral of electron-electron interaction, has been determined as 20.4 meV with a spread of 1.4 meV across the wide population of quantum dots. We also evidence an unexpected decrease of energy difference between the singlet and triplet states under a magnetic field in Faraday geometry.

References in corpus (3)

• Excitation mechanisms of individual CdTe/ZnTe quantum dots studied by photon correlation spectroscopy
• Polarization sensitive spectroscopy of charged Quantum Dots
• In-plane radiative recombination channel of a dark exciton in self-assembled quantum dots

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• Dynamics and relaxation of sp biexcitons in disk-shaped quantum dots
• Optical signatures of spin dependent coupling in semimagnetic quantum dot molecules