Kerr effect induced by exchange interaction of electrons separated by a tunnel barrier in a double quantum well
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2025
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| author | Kalevich, V. K. Kavokin, K. V. Afanasiev, M. M. Gribakin, B. F. Kuzmenko, M. I. Karczewski, G. Kusrayev, Yu. G. |
| author_facet | Kalevich, V. K. Kavokin, K. V. Afanasiev, M. M. Gribakin, B. F. Kuzmenko, M. I. Karczewski, G. Kusrayev, Yu. G. |
| contents | In a structure with two tunnel-coupled quantum wells of different widths, the spin dynamics resulting from resonant pulsed optical pumping of the narrow-well exciton includes the wide-well electron magnetization dynamics. Our analysis shows that the effect is driven by electron exchange between narrow-well excitons and spin-polarized electrons in the wide well. A theoretical model of the spin Kerr effect has been developed accounting for the interwell electron spin exchange. In the studied double-well structure with CdTe and Cd$_{0.98}$Mn$_{0.02}$Te quantum wells and a well-separating barrier thickness of 5 monolayers (1.6 nm), the model accurately describes the experimental results and allows us to estimate the interwell electron exchange constant as $δ_{e} \approx 0.9\times10^{-15}~\textrm{eV}~\textrm{cm}^{2}$. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2512_09541 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Kerr effect induced by exchange interaction of electrons separated by a tunnel barrier in a double quantum well Kalevich, V. K. Kavokin, K. V. Afanasiev, M. M. Gribakin, B. F. Kuzmenko, M. I. Karczewski, G. Kusrayev, Yu. G. Mesoscale and Nanoscale Physics 81V99 In a structure with two tunnel-coupled quantum wells of different widths, the spin dynamics resulting from resonant pulsed optical pumping of the narrow-well exciton includes the wide-well electron magnetization dynamics. Our analysis shows that the effect is driven by electron exchange between narrow-well excitons and spin-polarized electrons in the wide well. A theoretical model of the spin Kerr effect has been developed accounting for the interwell electron spin exchange. In the studied double-well structure with CdTe and Cd$_{0.98}$Mn$_{0.02}$Te quantum wells and a well-separating barrier thickness of 5 monolayers (1.6 nm), the model accurately describes the experimental results and allows us to estimate the interwell electron exchange constant as $δ_{e} \approx 0.9\times10^{-15}~\textrm{eV}~\textrm{cm}^{2}$. |
| title | Kerr effect induced by exchange interaction of electrons separated by a tunnel barrier in a double quantum well |
| topic | Mesoscale and Nanoscale Physics 81V99 |
| url | https://arxiv.org/abs/2512.09541 |