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A Dielectric tensor in an isotropic media

  1. May 8, 2017 #1
  2. jcsd
  3. May 8, 2017 #2


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    Spatial dispersion. If you allow for the polarisation to depend nonlocally on the field, and do a Taylor expansion, you get these k dependent terms. In an isotropic and optically active medium, also terms of first order in k appear.
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