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Journal Article

Accessing Ultrafast Spin-Transport Dynamics in Copper Using Broadband Terahertz Spectroscopy

MPS-Authors
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Rouzegar,  Reza
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Gückstock,  Oliver
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Seifert,  Tom
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Kampfrath,  Tobias       
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Fulltext (public)

arXiv:2310.12082.pdf
(Preprint), 986KB

PhysRevLett.132.226703.pdf
(Publisher version), 887KB

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Citation

Jechumtál, J., Rouzegar, R., Gückstock, O., Denker, C., Hoppe, W., Remy, Q., et al. (2024). Accessing Ultrafast Spin-Transport Dynamics in Copper Using Broadband Terahertz Spectroscopy. Physical Review Letters, 132(22): 226703. doi:10.1103/PhysRevLett.132.226703.


Cite as: https://hdl.handle.net/21.11116/0000-000E-521B-8
Abstract
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.