Effect of photoexcited carrier density on spin diffusion coefficient and helical spin lifetime
We investigate the effect of the photoexcited carrier density on helical spin dynamics using time- and spatially resolved magneto-optical Kerr rotation measurements. The helical spin lifetime is extended by increasing the photoexcited electron spin density because the phase decoherence by spin prece...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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American Physical Society
2025-04-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.7.023072 |
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| _version_ | 1850148531600359424 |
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| author | Ryo Tokimitsu Takachika Mori Jun Ishihara Makoto Kohda Yuzo Ohno Kensuke Miyajima |
| author_facet | Ryo Tokimitsu Takachika Mori Jun Ishihara Makoto Kohda Yuzo Ohno Kensuke Miyajima |
| author_sort | Ryo Tokimitsu |
| collection | DOAJ |
| description | We investigate the effect of the photoexcited carrier density on helical spin dynamics using time- and spatially resolved magneto-optical Kerr rotation measurements. The helical spin lifetime is extended by increasing the photoexcited electron spin density because the phase decoherence by spin precession is suppressed owing to a decrease in the spin diffusion coefficient. As a result of the quantitative estimation of the photoexcited carrier density dependence of the spin-orbit parameters, the effect of the decrease in the spin diffusion coefficient on the helical spin lifetime is larger than that due to the modulation of the deviation from the persistent spin helix by optical doping. |
| format | Article |
| id | doaj-art-e9e076b39edf4e04a5eac0f7f32f170e |
| institution | OA Journals |
| issn | 2643-1564 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj-art-e9e076b39edf4e04a5eac0f7f32f170e2025-08-20T02:27:14ZengAmerican Physical SocietyPhysical Review Research2643-15642025-04-017202307210.1103/PhysRevResearch.7.023072Effect of photoexcited carrier density on spin diffusion coefficient and helical spin lifetimeRyo TokimitsuTakachika MoriJun IshiharaMakoto KohdaYuzo OhnoKensuke MiyajimaWe investigate the effect of the photoexcited carrier density on helical spin dynamics using time- and spatially resolved magneto-optical Kerr rotation measurements. The helical spin lifetime is extended by increasing the photoexcited electron spin density because the phase decoherence by spin precession is suppressed owing to a decrease in the spin diffusion coefficient. As a result of the quantitative estimation of the photoexcited carrier density dependence of the spin-orbit parameters, the effect of the decrease in the spin diffusion coefficient on the helical spin lifetime is larger than that due to the modulation of the deviation from the persistent spin helix by optical doping.http://doi.org/10.1103/PhysRevResearch.7.023072 |
| spellingShingle | Ryo Tokimitsu Takachika Mori Jun Ishihara Makoto Kohda Yuzo Ohno Kensuke Miyajima Effect of photoexcited carrier density on spin diffusion coefficient and helical spin lifetime Physical Review Research |
| title | Effect of photoexcited carrier density on spin diffusion coefficient and helical spin lifetime |
| title_full | Effect of photoexcited carrier density on spin diffusion coefficient and helical spin lifetime |
| title_fullStr | Effect of photoexcited carrier density on spin diffusion coefficient and helical spin lifetime |
| title_full_unstemmed | Effect of photoexcited carrier density on spin diffusion coefficient and helical spin lifetime |
| title_short | Effect of photoexcited carrier density on spin diffusion coefficient and helical spin lifetime |
| title_sort | effect of photoexcited carrier density on spin diffusion coefficient and helical spin lifetime |
| url | http://doi.org/10.1103/PhysRevResearch.7.023072 |
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