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  • quantum mechanics - What is a phonon? - Physics Stack . . .
    No, because whilst the phonon has a wave nature like the E=hf photon, the phonon is typically a longitudinal wave like a sound wave, whilst the photon is a transverse wave Note however that phonons can be transverse waves, see the acoustic and optical phonons section of the Wikipedia article
  • 有问题，就会有答案 - 知乎
    声子（Phonon）是晶体中晶体结构集体激发的准粒子，化学势为零，服从玻色-爱因斯坦统计，是一种玻色子。声子本身并不具有物理动量，但是携带有准动量 ，并具有能量 （其中 为约化普朗克常数）。 根据…
  • 什么是 zero-phonon-line？ - 知乎
    零声子线和声子带（phonon side band or phonon wing）的定义最初是从穆斯堡尔谱中伽马射线与原子核之间的弹性与非弹性作用的来的 （Impurity spectra of solids, Rebane, K K , 1970)
  • 如何看待《自然》于2019年12月所刊论文中提到的新的热传导 . . .
    Phonon heat transfer across a vacuum through quantum fluctuations | Request PDFhttps: www nature …
  • Rest mass of phonon: is this concept definable?
    The phonon dispersion relation that you wrote down tells us that we can excite a phonon mode, with some finite momentum, using an arbitrarily small amount of energy, hence they have no rest mass (in condensed matter
  • solid state physics - Do we say that phonon has effective . . .
    Phonon dispersions are generally indicated by a linear spectrum, so the second derivative is 0 Thus phonons are effectively massless, and have a velocity given by the first derivative Thus phonons are effectively massless, and have a velocity given by the first derivative
  • Free acoustic phonon propagator - Physics Stack Exchange
    The reason why you get a weird pole at $\omega = 0$ in your first attempt to find the propagator of a free acoustic phonon is that the transversal oscillations which are always part of the displacements vectorial field are not considered in your approach It appears that in the formula you obtained the propagation velocity of transversal oscillations is taken equal to $0$
  • condensed matter - What are phonon frequencies in solids . . .
    Although the Wikipedia page gives a good introduction to the concept of phonons, it very quickly introduces the approximation of nearest-neighbour interactions, and doesn't give some of the important details about how the phonon frequencies are calculated in terms of the interaction potentials
  • Can someone explain LO-TO Splitting? - Physics Stack . . .
    For infrared phonon modes, the mode itself splits into 2, one TO and LO, due to the polarity of the material There is a simple explanation for this in Mark Fox's book in the phonons chapter There is a simple explanation for this in Mark Fox's book in the phonons chapter
  • What are soft phonon modes? - Physics Stack Exchange
    Soft phonon modes are the normal modes at finite wavevectors, whose frequency approaches zero as an effect of varying some parameter of the system Their importance stems from the fact that in some cases, like continuous





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