Effect of photoexcited carrier density on spin diffusion coefficient and helical spin lifetime

Ryo Tokimitsu; Takachika Mori; Jun Ishihara; Makoto Kohda; Yuzo Ohno; Kensuke Miyajima

doi:10.1103/PhysRevResearch.7.023072

Effect of photoexcited carrier density on spin diffusion coefficient and helical spin lifetime

Ryo Tokimitsu
, Takachika Mori
, Jun Ishihara
, Makoto Kohda
, Yuzo Ohno
, Kensuke Miyajima

研究成果: Article › 査読

2 被引用数 (Scopus)

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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.

本文言語	English
論文番号	023072
ジャーナル	Physical Review Research
巻	7
号	2
DOI	https://doi.org/10.1103/PhysRevResearch.7.023072
出版ステータス	Published - 4月 2025

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10.1103/PhysRevResearch.7.023072

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title = "Effect of photoexcited carrier density on spin diffusion coefficient and helical spin lifetime",

abstract = "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.",

author = "Ryo Tokimitsu and Takachika Mori and Jun Ishihara and Makoto Kohda and Yuzo Ohno and Kensuke Miyajima",

note = "Publisher Copyright: {\textcopyright} 2025 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.",

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T1 - Effect of photoexcited carrier density on spin diffusion coefficient and helical spin lifetime

AU - Tokimitsu, Ryo

AU - Mori, Takachika

AU - Ishihara, Jun

AU - Kohda, Makoto

AU - Ohno, Yuzo

AU - Miyajima, Kensuke

N1 - Publisher Copyright: © 2025 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

PY - 2025/4

Y1 - 2025/4

N2 - 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.

AB - 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.

UR - https://www.scopus.com/pages/publications/105003408920

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DO - 10.1103/PhysRevResearch.7.023072

M3 - Article

AN - SCOPUS:105003408920

SN - 2643-1564

VL - 7

JO - Physical Review Research

JF - Physical Review Research

IS - 2

M1 - 023072

ER -

Effect of photoexcited carrier density on spin diffusion coefficient and helical spin lifetime

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