Accessing ultrafast spin-transport dynamics in copper using broadband terahertz spectroscopy
arxiv(2023)
摘要
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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