Manipulating the exciton fine structure of single CdTe/ZnTe quantum dots by an in-plane magnetic field

Abstract

Polarization resolved photoluminescence (PL) spectroscopy of individual CdTe/ZnTe quantum dots is investigated in the presence of external in-plane magnetic field. We find that the excitonic fine structure strongly depends on the magnitude and direction of applied field. The splitting between "bright" and "dark" states increases with the magnetic field, whereas the anisotropic exchange splitting of the bright excitons can be reduced or enhanced, depending on the field direction. Increase (decrease) is observed when the field is applied parallel to the PL polarization direction of the lower (upper) energy exciton. For intermediate fields, we observe a rotation of the PL polarization orientation. The results are discussed in terms of an effective spin Hamiltonian derived for the exciton ground state.

6 pages, 6 figures

References in corpus (6)

• Entangled Photon Pairs from Semiconductor Quantum Dots
• Size-dependent fine-structure splitting in self-organized InAs/GaAs quantum dots
• Improved fidelity of triggered entangled photons from single quantum dots
• Manipulating exciton fine-structure in quantum dots with a lateral electric field
• Magnetic-field-induced reduction of the exciton polarization splitting in InAs quantum dots
• Inversion of exciton level splitting in quantum dots

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