Inverse exciton spin orientation due to trion formation in modulation doped quantum wells
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arXiv
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| Format: | Preprint |
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2023
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| _version_ | 1866914736869736448 |
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| author | Kotova, Lyubov Platonov, Alexei Kochereshko, Vladimir |
| author_facet | Kotova, Lyubov Platonov, Alexei Kochereshko, Vladimir |
| contents | Time-resolved and time-integrated circularly polarized photoluminescence of excitons and trions in external magnetic fields up to 10 T has been studied in undoped and n-type doped quantum well structures based on ZnSe. In an undoped structure, a circular polarization of photoluminescence induced by magnetic fields corresponded to the Boltzmann distribution of excitons on Zeeman sublevels. The inverse spin orientation of excitons is observed in doped samples with a carrier density of $3 \times 10^{10}$ cm$^{-2}$ and higher. Model calculations show that the reason for the inverse spin orientation is the effective depletion of the lowest-exciton Zeeman sublevel as a result of the spin-dependent formation of trions. The trion formation time as a result of exciton-electron binding was determined as 2 ps. This is noticeably shorter than the characteristic time of the exciton-photon interaction. The observed effect can be considered as a way of spin manipulation by electric fields. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2310_06651 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Inverse exciton spin orientation due to trion formation in modulation doped quantum wells Kotova, Lyubov Platonov, Alexei Kochereshko, Vladimir Mesoscale and Nanoscale Physics Time-resolved and time-integrated circularly polarized photoluminescence of excitons and trions in external magnetic fields up to 10 T has been studied in undoped and n-type doped quantum well structures based on ZnSe. In an undoped structure, a circular polarization of photoluminescence induced by magnetic fields corresponded to the Boltzmann distribution of excitons on Zeeman sublevels. The inverse spin orientation of excitons is observed in doped samples with a carrier density of $3 \times 10^{10}$ cm$^{-2}$ and higher. Model calculations show that the reason for the inverse spin orientation is the effective depletion of the lowest-exciton Zeeman sublevel as a result of the spin-dependent formation of trions. The trion formation time as a result of exciton-electron binding was determined as 2 ps. This is noticeably shorter than the characteristic time of the exciton-photon interaction. The observed effect can be considered as a way of spin manipulation by electric fields. |
| title | Inverse exciton spin orientation due to trion formation in modulation doped quantum wells |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2310.06651 |