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Explain why phonon dispersion only can be expressed in the first Brillouin zone, but the electron...

Explain why phonon dispersion only can be expressed in the first Brillouin zone, but the electron band structure can be extended to second or third Brillouin zone. (Please briefly description)

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phones are the basic of our understanding of the thermal properties of insulator such a specific heat and thermal conductivity.

It mentals however there a electric contributions as well they are basically the quanta of elastic wave in the solid compare with photos equnta they are Acoustic phonos at long wave/argt are sound vibration classically (as a set harmonic oscillation) or quantum mechanically. Quntum effect are always important for P hons
vibration classically (as a set harmonic oscillation) or quantum mechanically. Quntum effect are always important for P hons

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