Spin-flip Raman scattering of the $\Gamma$-X mixed exciton in indirect band-gap (In,Al)As/AlAs quantum dots

Abstract

The band structure of type-I (In,Al)As/AlAs quantum dots with band gap energy exceeding 1.63 eV is indirect in momentum space, leading to long-lived exciton states with potential applications in quantum information. Optical access to these excitons is provided by mixing of the $\Gamma$- and X-conduction band valleys, from which control of their spin states can be gained. This access is used here for studying the exciton spin-level structure by resonant spin-flip Raman scattering, allowing us to accurately measure the anisotropic hole and isotropic electron $g$ factors. The spin-flip mechanisms for the indirect exciton and its constituents as well as the underlying optical selection rules are determined. The spin-flip intensity is a reliable measure of the strength of $\Gamma$-X-valley mixing, as evidenced by both experiment and theory.

arXiv comment5 pages, 3 figures

References in corpus (7)

• Spin-flip transitions between Zeeman sublevels in semiconductor quantum dots
• Manipulation of the Spontaneous Emission Dynamics of Quantum Dots in 2D Photonic Crystals
• Universal behavior of the electron g-factor in GaAs/AlGaAs quantum wells
• Exciton spin relaxation in single semiconductor quantum dots
• Influence of the heterointerface sharpness on exciton recombination dynamics in an ensemble of (In,Al)As/AlAs quantum dots with indirect band-gap
• Spin-flip Raman scattering of the neutral and charged excitons confined in a CdTe/(Cd,Mg)Te quantum well
• Spin splitting of X-related donor impurity states in an AlAs barrier

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• Spin dynamics and magnetic-field-induced polarization of excitons in ultrathin GaAs/AlAs quantum wells with indirect band gap and type-II band alignment
• Dynamic polarization of electron spins interacting with nuclei in semiconductor nanostructures
• Dynamic polarization of electron spins in indirect band gap (In,Al)As/AlAs quantum dots in weak magnetic field: experiment and theory
• Investigation of in-plane nuclear field formation in single self-assembled quantum dots
• Unraveling spin dynamics from charge fluctuations
• Electron spin relaxation in X-valley of indirect bandgap AlxGa1-xAs: A new horizon for the realization of next generation spin-photonic devices
• Direct high resolution resonant Raman scattering measurements of InAs quantum dot dynamic nuclear spin polarization states
• Extending Qubit Coherence Time via Hybrid Dynamical Decoupling