Investigation of in-plane nuclear field formation in single self-assembled quantum dots

Abstract

We studied the formation mechanism of the in-plane nuclear field in single self-assembled In${}_{0.75}$Al${}_{0.25}$As/Al${}_{0.3}$Ga${}_{0.7}$As quantum dots. The Hanle curves with an anomalously large width and hysteretic behavior at the critical transverse magnetic field were observed in many single quantum dots grown in the same QD sample. In order to explain the anomalies in the Hanle curve indicating the formation of a large nuclear field perpendicular to the photo-injected electron spin polarization, we propose a new model based on the current phenomenological model for dynamic nuclear spin polarization. The model includes the effects of the nuclear quadrupole interaction and the sign inversion between in-plane and out-of-plane g-factors, and the model calculations reproduce successfully the characteristics of the observed anomalies in the Hanle curves.

7 pages, 6 figures

References in corpus (8)

• Nuclear spin physics in quantum dots: an optical investigation
• Bistability of the Nuclear Polarisation created through optical pumping in InGaAs Quantum Dots
• Nonlinear dynamics of quantum dot nuclear spins
• Stabilizing effect of nuclear quadrupole interaction on the polarization of electron-nuclear spin system in a quantum dot
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• Spin-flip Raman scattering of the $\Gamma$-X mixed exciton in indirect band-gap (In,Al)As/AlAs quantum dots
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• Spin dynamics of quadrupole nuclei in InGaAs quantum dots

Cited by in corpus (2)

• Third Stable Branch and Tristability of Nuclear Spin Polarization in Single Quantum Dot System
• Slowly generated anomalously large nuclear field in bulk n-AlGaAs