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Phonon number fluctuations in Debye model of solid
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Phonon number fluctuations in Debye model of solid
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The phonon number fluctuations in the Debye model of solid are calculated and are demonstrated to be proportional to the temperature cubed at low temperature, similar to the celebrated Debye's law of the heat capacity. For a fixed number of atoms, the relative fluctuations approach to infinity as the temperatture decreases to zero, and the proper definition of temperature needs more and more numbers of atoms at lower and lower temperatures, compatible with the third law on the unattainability of absolute zero temperature.
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