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Time-resolved lateral spin-caloric transport of optically generated spin packets in n-GaAs

We report on lateral spin-caloric transport (LSCT) of electron spin packets which are optically generated by ps laser pulses in the non-magnetic semiconductor n-GaAs at K. LSCT is driven by a local temperature gradient induced by an additional cw heating laser. The spatio-temporal evolution of the s...

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Bibliographic Details
Published in:Journal of physics. D, Applied physics Applied physics, 2018-05, Vol.51 (21), p.214003
Main Authors: Göbbels, Stefan, Güntherodt, Gernot, Beschoten, Bernd
Format: Article
Language:English
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Summary:We report on lateral spin-caloric transport (LSCT) of electron spin packets which are optically generated by ps laser pulses in the non-magnetic semiconductor n-GaAs at K. LSCT is driven by a local temperature gradient induced by an additional cw heating laser. The spatio-temporal evolution of the spin packets is probed using time-resolved Faraday rotation. We demonstrate that the local temperature-gradient induced spin diffusion is solely driven by a non-equilibrium hot spin distribution, i.e. without involvement of phonon drag effects. Additional electric field-driven spin drift experiments are used to verify directly the validity of the non-classical Einstein relation for moderately doped semiconductors at low temperatures for near band-gap excitation.
ISSN:0022-3727
1361-6463
DOI:10.1088/1361-6463/aabd99