Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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


    User Avatar
    Homework Helper

    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


    User Avatar
    Science Advisor

    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.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook