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Accessing ultrafast spin-transport dynamics in copper using broadband terahertz spectroscopy

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arxiv 2310.12082 v3 pith:KH3ZHGE7 submitted 2023-10-18 cond-mat.mes-hall cond-mat.mtrl-sci

Accessing ultrafast spin-transport dynamics in copper using broadband terahertz spectroscopy

Ji\v{r}\'i Jechumt\'al , Reza Rouzegar , Oliver Gueckstock , Christian Denker , Wolfgang Hoppe , Quentin Remy , Tom S. Seifert , Peter Kuba\v{s}\v{c}\'ik
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Georg Woltersdorf Piet W. Brouwer Markus M\"unzenberg Tobias Kampfrath Luk\'a\v{s} N\'advorn\'ik
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classification cond-mat.mes-hall cond-mat.mtrl-sci
keywords broadbandcopperdynamicspulsespectroscopyterahertztransportultrafast
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We study the spatiotemporal dynamics of ultrafast electron spin transport across nanometer-thick copper layers using broadband terahertz spectroscopy. Our analysis of temporal delays, broadening and attenuation of the spin-current pulse revealed ballistic-like propagation of the pulse peak, approaching the Fermi velocity, and diffusive features including a significant velocity dispersion. A comparison to the frequency-dependent Ficks law identified the diffusion-dominated transport regime for distances larger than 2 nm. The findings lie the groundwork for designing future broadband spintronic devices.

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