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Spin transport (diffusion and ballistic)

  1. Jul 14, 2011 #1
    Can anybody explain in a few words these two modes of spin transport and what are the difference between them. Thanks.
     
  2. jcsd
  3. Jul 15, 2011 #2
    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.
     
  4. Jul 15, 2011 #3

    Thanks a lot. Could u please suggest any reference to read. As I googled this question a lot but did not find reference that treats explains this.
     
  5. Jul 16, 2011 #4
    http://en.wikipedia.org/wiki/Ballistic_transport

    http://en.wikipedia.org/wiki/Diffusion

    http://en.wikipedia.org/wiki/Mean_free_path

    Related ballistic/diffusive transition at Mean Free Path in fluid mechanics is

    http://en.wikipedia.org/wiki/Knudsen_number

    Googling "Spin Transport" and starting on page 11:

    http://www.mpipks-dresden.mpg.de/~cord/dresden.pdf

    How hard did you look? All these links were on the 1st page of results of Googling "Ballistic Transport", "Diffusive Transport", "Mean Free Path" and "Spin Transport".
     
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