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What is a clear definition of vibrons? Vibrons are localized Phonons and I need more information about them. It is somewhat vague to me. Can you give some references, please?

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  • $\begingroup$ I've never heard of a vibron before, but a quick search makes me think that a vibron is a vibration in a molecule -- not a bulk material. (Whereas a phonon makes more sense in a bulk material.) $\endgroup$ – lnmaurer Dec 31 '15 at 2:18
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The term vibron isn't a standard accepted word in solid state physics. It's simply a synonym of a phonon, which was probably coined before phonon.

As far as localization is concerned, phonons can be localized too. For example, in a crystal lattice, the vibrations can propagate throughout the crystal, or there can be vibrations in only a small localized part of the crystal. In both the cases, the resulting vibrational quanta can be called a phonon.

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