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

Autor:	Jechumtál, Jiří, Rouzegar, Reza, Gueckstock, Oliver, Denker, Christian, Hoppe, Wolfgang, Remy, Quentin, Seifert, Tom S., Kubaščík, Peter, Woltersdorf, Georg, Brouwer, Piet W., Münzenberg, Markus, Kampfrath, Tobias, Nádvorník, Lukáš
Rok vydání:	2023
Předmět:	Condensed Matter - Mesoscale and Nanoscale Physics Condensed Matter - Materials Science
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevLett.132.226703
Popis:	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. Comment: V3: AAM, Licence: CC BY Main text consists of 3 figures and 4 pages of text
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2310.12082 Zobrazit plný text záznamu View this record from Arxiv