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Article Dans Une Revue Physical Review B Année : 2022

Spin dynamics of positively charged excitons in Cr + -doped quantum dots probed by resonant photoluminescence

Résumé

We study the dynamics of the spin system that consist of a positively charged II-VI semiconductor quantum dot doped with a single Cr + ion. The resonant photoluminescence (PL) of the positively charged exciton coupled with the Cr + spin is used to analyze the main spin relaxation channels. The intensity of the resonant PL is reduced by an optical pumping of the spin of the resident hole-Cr + complex that can be seen as a nano-magnet. The spin memory can be partially erased by a non-resonant optical excitation. This leads to an increase of the resonant PL signal. The resonant PL is co-circularly polarized and corresponds to relaxation channels that conserve the Cr + spin |Sz|. The observation in the resonant-PL excitation spectra of optical transitions with a change of the Cr + spin permits to determine the magnetic anisotropy of the magnetic atom. Optical pumping, auto-correlation measurements and the power dependence of the PL intensity distribution show that the effective temperature of the hole-Cr + spin system is affected by the optical excitation through the local generation of phonons.
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Dates et versions

hal-03755511 , version 1 (22-08-2022)

Identifiants

Citer

V. Tiwari, M. Morita, T. Inoue, S. Ando, S. Kuroda, et al.. Spin dynamics of positively charged excitons in Cr + -doped quantum dots probed by resonant photoluminescence. Physical Review B, 2022, 106 (4), pp.045308. ⟨10.1103/PhysRevB.106.045308⟩. ⟨hal-03755511⟩

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