Inter-shell exchange interaction in CdTe/ZnTe quantum dots: magneto-photoluminescence of X, X2- and XX-

Abstract

We present a comprehensive photoluminescence study of exchange interaction in self-assembled CdTe/ZnTe quantum dots. We exploit the presence of multiple charge states in the photoluminescence spectra of single quantum dots to analyze simultaneously fine structure of different excitonic transitions, including recombination of neutral exciton/biexciton, doubly charged negative exciton and negatively charged biexciton. We demonstrate that the fine structure results from electron-hole exchange interaction and that spin Hamiltonians with effective exchange constants ${\delta }_i$ can provide a good description of each transition in magnetic field for Faraday and Voigt field geometry. We determine and discuss values of the effective exchange constants for a large statistics of quantum dots.

References in corpus (9)

• Entangled Photon Pairs from Semiconductor Quantum Dots
• Optical manipulation of a single Mn spin in a CdTe-based quantum dot
• Excitation mechanisms of individual CdTe/ZnTe quantum dots studied by photon correlation spectroscopy
• Polarization sensitive spectroscopy of charged Quantum Dots
• Optically induced energy and spin transfer in non-resonantly coupled pairs of self-assembled CdTe/ZnTe quantum dots
• Brightening of dark excitons in a single quantum dot containing a single magnetic ion
• Manipulating the exciton fine structure of single CdTe/ZnTe quantum dots by an in-plane magnetic field
• Picosecond charge variation of quantum dots under pulsed excitation
• Stark Spectroscopy and Radiative Lifetimes in Single Self-Assembled CdTe Quantum Dots

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