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

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SUMMARY

The discussion centers on the lower limit of the frequency range of active acoustic phonon modes. Participants clarify that while textbooks suggest the frequency can approach zero, practical considerations indicate that phonon modes with extremely low energy, such as 1 microvolt, may not yield significant experimental results. The consensus is that while theoretically possible, the relevance of such low-energy phonon modes in experiments is questionable.

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zhanhai
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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?
 
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Microvolts for frequency?
 

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