Applied Magnetic Resonance

, Volume 48, Issue 7, pp 635–655 | Cite as

Electron–Nuclear Spin Dynamics in Semiconductor QDs

Original Paper
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Abstract

This work presents an overview of investigations of the nuclear spin dynamics in nanostructures with negatively charged InGaAs/GaAs quantum dots characterized by strong quadrupole splitting of nuclear spin sublevels. The main method of the investigations is the experimental measurements and the theoretical analysis of the photoluminescence polarization as a function of the transverse magnetic field (effect Hanle). The dependence of the Hanle curve profile on the temporal protocol of optical excitation is examined. Experimental data are analyzed using an original approach based on separate consideration of behavior of the longitudinal and transverse components of the nuclear polarization. The rise and decay times of each component of the nuclear polarization and their dependence on transverse magnetic field strength are determined. To study the role of the Knight field in the dynamic of nuclear polarization, a weak additional magnetic field parallel to the optical axis is used. We have found that, only taking into account the nuclear spin fluctuations, we can accurately describe the measured Hanle curves and evaluate the parameters of the electron–nuclear spin system in the studied quantum dots. A new effect of the resonant optical pumping of nuclear spin polarization in an ensemble of the singly charged (In,Ga)As/GaAs quantum dots subjected to a transverse magnetic field is discussed. Nuclear spin resonances for all isotopes in the quantum dots are detected in that way. In particular, transitions between the states split off from the ±1/2 doublets by the nuclear quadrupole interaction are identified.

Keywords

Nuclear Spin Dynamic Nuclear Polarization Transverse Magnetic Field Nuclear Polarization Electron Spin Polarization 

Notes

Acknowledgements

I thank I.V. Ignatev, R.V. Cherbunin, I.Ya. Gerlovin, K.V. Kavokin, S.Yu. Verbin and M.Yu. Petrov for fruitful discussions, D.R. Yakovlev and M. Bayer for collaboration, and D. Reuter and A. D. Wieck for the high-quality samples. The work is supported by the Russian Foundation for Basic Research (project no. 15-52-12020) and the Deutsche Forschungsgemeinschaft in the frame of International Collaborative Research Center TRR160.

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Copyright information

© Springer-Verlag Wien 2017

Authors and Affiliations

  1. 1.Physics DepartmentSaint Petersburg State UniversitySt. PetersburgRussia
  2. 2.Spin Optics LaboratorySaint Petersburg State UniversitySt. PetersburgRussia
  3. 3.Experimentelle Physik 2TechnischeUniversität DortmundDortmundGermany

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