Optical properties of AlGaAs/GaAs resonant Bragg structure at the second quantum state
Выставление онлайн: 20 марта 2018 г.
Photoluminescence, optical reflectance and electro-reflectance spectroscopies were employed to study an AlGaAs/GaAs multiple-quantum-well based resonant Bragg structure, which was designed to match optical Bragg resonance with the exciton-polariton resonance at the second quantum state in the GaAs quantum wells. The structure with 60 periods of AlGaAs GaAs quantum wells was grown on a semi-insulating substrate by molecular beam epitaxy. Broad and enhanced optical and electro-reflectance features were observed when the Bragg resonance was tuned to the second quantum state of the GaAs quantum well excitons manifesting an enhancement of the light-matter interaction under double-resonance conditions. By applying an alternating electric field, we revealed electro-reflectance features related to the x(e2-hh2) and x(e2-hh1) excitons. The excitonic transition x(e2-hh1), which is prohibited at zero electric field, was allowed by a DC bias due to brake of symmetry and increased overlap of the electron and hole wave functions caused by electric field. Acknowledgements This research at the Ioffe Institute was supported by the Russian Federal Agency of Scientific Organizations. It was also supported by the PSC-CUNY grant at Brooklyn College. The XRD research was carried out at the Joint Research Center "Material science and characterization in advanced technology" under the financial support by the Ministry of Education and Science of the Russian Federation (Agreement 14.621.21.0013,28.18.2017).
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