Spin inertia and polarization recovery in quantum dots: Role of pumping strength and resonant spin amplification

Abstract

Spin inertia measurements are a novel experimental tool to study long-time spin relaxation processes in semiconductor nanostructures. We develop a theory of the spin inertia effect for resident electrons and holes localized in quantum dots. We consider the spin orientation by short optical pulses with arbitrary pulse area and detuning from the trion resonance. The interaction with an external longitudinal magnetic field and the hyperfine interaction with the nuclear spin bath is considered in both the ground and excited (trion) states of the quantum dots. We analyze how the spin inertia signal depends on the magnetic field (polarization recovery) and on the modulation frequency of the helicity of the pump pulses as well as on their power and detuning. In particular, we elaborate how approaching the saturation limit of the spin polarization influences the measurements. The quantitative description of spin inertia measurements will enable the determination of the parameters of spin dynamics such as the spin relaxation times in the ground and excited states and the parameters of the hyperfine interaction. Finally, we predict the emergence of resonant spin amplification due to the transverse components of the nuclear spin fluctuations, which manifests itself as oscillations of the spin polarization as a function of the longitudinal magnetic field.

13 pages, 7 figures

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Cited by in corpus (10)

• Spin polarization recovery and Hanle effect for charge carriers interacting with nuclear spins in semiconductors
• Interplay of spin mode locking and nuclei-induced frequency focusing in quantum dots
• Driven dynamics of a quantum dot electron spin coupled to bath of higher-spin nuclei
• Resonant spin amplification meets electron spin resonance in $n$-GaAs
• Tuning the nuclei-induced spin relaxation of localized electrons by the quantum Zeno and anti-Zeno effects
• Nuclear magnetic resonance spectroscopy of nonequilibrium steady states in quantum dots
• Quantum dynamics of Gaudin magnets
• Resonant spin amplification in Faraday geometry
• Simulation of nonequilibrium spin dynamics in quantum dots subjected to periodic laser pulses
• Truncated Wigner approximation for the bosonic model of large spin baths