Nuclear magnetic resonances in (In,Ga)As/GaAs quantum dots studied by resonant optical pumping

Abstract

The photoluminescence polarizations of (In,Ga)As/GaAs quantum dots annealed at different temperatures are studied as a function of external magnetic field (Hanle curves). In these dependencies, remarkable resonant features appear due to all-optical nuclear magnetic resonances (NMR) for optical excitation with modulated circular polarization. Application of an additional radio-frequency field synchronously with the polarization modulation strongly modifies the NMR features. The resonances can be related to transitions between different nuclear spin states split by the strain-induced gradient of the crystal field and by the externally applied magnetic field. A theoretical model is developed to simulate quadrupole and Zeeman splittings of the nuclear spins in a strained quantum dot. Comparison with the experiment allows us to uniquely identify the observed resonances. The large broadening of the NMR resonances is attributed to variations of the quadrupole splitting within the quantum dot volume, which is well described by the model.

arXiv comment12 pages, 10 figures

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Cited by in corpus (11)

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• Theory of spin inertia in singly-charged quantum dots
• Nuclear magnetic resonance inverse spectra of InGaAs quantum dots: Atomistic level structural information
• Influence of the nuclear Zeeman effect on mode locking in pulsed semiconductor quantum dots
• Cross-calibration of GaAs deformation potentials and gradient-elastic tensors using photoluminescence and nuclear magnetic resonance spectroscopy in GaAs/AlGaAs quantum dot structures
• Reconstruction of nuclear quadrupole interaction in (In,Ga)As/GaAs quantum dots observed by transmission electron microscopy
• Limitation of electron mobility from hyperfine interaction in ultra-clean quantum wells and topological insulators
• Probing strain modulation in a gate-defined one dimensional electron system
• Cat-state generation and stabilization for a nuclear spin through electric quadrupole interaction
• Spin dynamics of quadrupole nuclei in InGaAs quantum dots