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What is the lower limit of frequency range of acoustic phonon modes?

  1. Nov 3, 2014 #1
    Good day everyone.

    I would like to know about the lower limit of the frequency range of active acoustic phonon modes. Textbooks say it can reach zero. But I am curious about whether it can be very small, such as 1 micro volt or the like. Would a phonon mode of so small energy be of any significance to experimental results?
     
  2. jcsd
  3. Nov 3, 2014 #2
    Microvolts for frequency?
     
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