Measurement of the g-factor tensor in a quantum dot and disentanglement of excition spins
B. J. Witek (TU Delft - QN/Quantum Transport)
R. W. Heeres (TU Delft - QN/Quantum Transport)
U Perinetti (TU Delft - QN/Quantum Transport)
E. P.A.M. Bakkers (TU Delft - QN/Quantum Transport)
Leo Kouwenhoven (TU Delft - QN/Quantum Transport)
V. Zwiller (TU Delft - QN/Quantum Transport)
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Abstract
We perform polarization-resolved magneto-optical measurements on single InAsP quantum dots embedded
in an InP nanowire. In order to determine all elements of the electron and hole g-factor tensors, we measure
in magnetic fields with different orientations. The results of these measurements are in good agreement with
a model based on exchange terms and Zeeman interaction. In our experiment, polarization analysis delivers a
powerful tool that not only significantly increases the precision of the measurements, but also enables us to probe
the exciton spin-state evolution in magnetic fields. We propose a disentangling scheme of heavy-hole exciton
spins enabling a measurement of the electron spin T2-time.
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