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

Jechumtál, Jiří; Rouzegar, Reza; Gückstock, Oliver; Denker, Christian; Hoppe, Wolfgang; Remy, Quentin; Seifert, Tom; Kubaščík, Peter; Woltersdorf, Georg; Brouwer, Piet W.; Münzenberg, Markus; Kampfrath, Tobias; Nádvorník, Lukáš

doi:10.1103/PhysRevLett.132.226703

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学術論文

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;

/persons/resource/persons209285

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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フルテキスト (公開)

arXiv:2310.12082.pdf
(プレプリント), 986KB

PhysRevLett.132.226703.pdf
(出版社版), 887KB

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引用

Jechumtál, J., Rouzegar, R., Gückstock, O., Denker, C., Hoppe, W., Remy, Q., Seifert, T., Kubaščík, P., Woltersdorf, G., Brouwer, P. W., Münzenberg, M., Kampfrath, T., & Nádvorník, L. (2024). Accessing Ultrafast Spin-Transport Dynamics in Copper Using Broadband Terahertz Spectroscopy. Physical Review Letters, 132(22):. doi:10.1103/PhysRevLett.132.226703.

引用: https://hdl.handle.net/21.11116/0000-000E-521B-8

要旨

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.