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Effect of Negative permittivity?

  1. Dec 2, 2009 #1
    Does anyone know how quantum theory accounts for a ε value that is negative?
    Wouldn't this change probability densities?
  2. jcsd
  3. Dec 3, 2009 #2


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    You can have a negative permittivity, no problem. For example, an implicit equation for the dispersion of surface plasmons is given by setting the (frequency and wavelength dependent) permittivity to -1.
  4. Dec 3, 2009 #3


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    Usually a negative permittivity arises just above a resonance where the polarization is 180 degree out of phase with the driving field. This can already be understood in the case of a classical driven harmonic oscillator.
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