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Dielectric constant in few-layer and in bulk materials

  1. Jul 26, 2015 #1
    Why is the dielectric constant smaller in few-layer materials than in bulk materials?
  2. jcsd
  3. Jul 28, 2015 #2
    I believe this is an open research topic, at least for materials such as SrTiO3 known as incipient ferroelectrics . For SrTiO3 an optical phonon mode is soft within harmonic approximation in bulk samples and is responsible for the high dielectric constant . Somehow (several mechanisms exist in literature) , this phonon mode gets hardened in thin films and as such the dielectric constant is much smaller for the thing film. I would interested to hear any insights on this topic.

    See this article as an example:
    Last edited by a moderator: May 7, 2017
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