Unveiling the spin-singlet states of two electron-hole pair complexes using two-photon excitation in a GaAs/AlAs quantum dot - Archive ouverte HAL
Journal Articles Physical Review B Year : 2022

Unveiling the spin-singlet states of two electron-hole pair complexes using two-photon excitation in a GaAs/AlAs quantum dot

Abstract

We use two-photon excitation to create biexcitonic complexes with two electron-hole pairs in different orbital levels of a GaAs/AlAs quantum dot. In addition to p-shell emission of the biexcitonic triplet states generated by two-photon excitation, we observe additional higher-energy resonances which are a signature of the radiative cascade of two-photon excited singlet states. The detection of these signals obtained in a high excitation regime is made possible by the use of a waveguiding structure in which the quantum dots are inserted, allowing an orthogonal excitation and detection geometry with an excellent laser rejection.
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Dates and versions

hal-03703408 , version 1 (23-06-2022)

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S Germanis, P Atkinson, A Bach, R Hostein, R Braive, et al.. Unveiling the spin-singlet states of two electron-hole pair complexes using two-photon excitation in a GaAs/AlAs quantum dot. Physical Review B, 2022, 105 (23), pp.235430. ⟨10.1103/physrevb.105.235430⟩. ⟨hal-03703408⟩
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