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- W3197100514 abstract "Using pure spin current transport measurements in lateral spin-valve devices, we study the spin relaxation in an $n$-type nondegenerate Ge layer, which is moderately doped Ge (P: $ensuremath{sim}{10}^{18}$ ${mathrm{cm}}^{ensuremath{-}3}$). The obtained spin diffusion length $({ensuremath{lambda}}_{mathrm{Ge}})$ of the nondegenerate Ge is two to three times greater than that of heavily doped degenerate Ge (P: $ensuremath{sim}{10}^{19}$ ${mathrm{cm}}^{ensuremath{-}3}$) in the temperature range from 8 to 100 K. We find that the electron spin lifetime ($ensuremath{tau}$) for the nondegenerate Ge is monotonically increased with decreasing temperature $(T)$. The increase in $ensuremath{tau}$ at temperatures less than 50 K can be interpreted in terms of the donor-driven spin relaxation mechanism including the 1/$sqrt{T}$ behavior in multivalley semiconductors, proposed by Song et al. [Y. Song, O. Chalaev, and H. Dery, Phys. Rev. Lett. 113, 167201 (2014)]. We note that it is important for the $ensuremath{tau}$ of the moderately doped nondegenerate Ge to partly consider the $T$-independent component of spin relaxation in addition to the 1/$sqrt{T}$ component." @default.
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- W3197100514 date "2021-09-01" @default.
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- W3197100514 title "Experimental extraction of donor-driven spin relaxation in <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mi>n</mml:mi></mml:math> -type nondegenerate germanium" @default.
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- W3197100514 doi "https://doi.org/10.1103/physrevb.104.115301" @default.
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