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Can anybody explain in a few words these two modes of spin transport and what are the difference between them. Thanks.
ExcitonPsi said:In general, ballistic transport is when the scattering length (mean free path) of the particles is large compared to the transport distance. So the particles move in a straight line from point A to point B.
If you are looking at transport on a length scale much larger than the scattering length, there will be many scattering events, and the particle motion will be more like a random walk (instead of a straight line). This is diffusion.
Spin transport refers to the movement of electrons' spin states in a material. This can occur through diffusion, where the spin states gradually spread out, or through ballistic transport, where the spin states maintain their direction and travel long distances without scattering.
In spin diffusion, the spin states of electrons gradually spread out due to interactions with impurities or defects in the material. This results in a randomization of the spin directions. In spin ballistic transport, the spin states maintain their direction and travel without being scattered, leading to a longer spin coherence length.
Spin transport can be measured using various experimental techniques such as spin Hall effect, spin pumping, and spin Seebeck effect. These methods involve applying a magnetic field or temperature gradient in a material and measuring the resulting spin current or voltage.
Spin transport has potential applications in spintronics, a field that aims to use the spin of electrons in addition to their charge for information processing and storage. This includes spin-based logic devices, spin valves for data storage, and spin-based sensors.
Spin transport can have a significant impact on the performance of electronic devices, especially in the emerging field of spintronics. Efficient spin transport is crucial for the operation of spin-based devices and materials with longer spin coherence lengths are desirable for better functionality and stability.