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quantum mechanics - What is a phonon? - Physics Stack Exchange
WEBSep 26, 2013 · In quantum field theory a particle is an excitation of a field, described by creation and annihilation operators. A phonon is likewise an excitation described by creation and annihilation operators. These operators obey commutation relations, which tell us the phonon is a boson. Again, I'm not sure that it's meaningful to talk about "the
Physics.stackexchange.comWhy are phonons bosons if they cannot occupy the same …
WEBJan 17, 2022 · When the question "what is a quantum particle --- a phonon, a photon, an electron, a Higgs ?" is asked, then the answer should be--- and here for concreteness I will replace the word "quantum particle" by phonon ---One phonon is the first and lowest (above the ground state) excitation of the quantum field — here the crystal lattice.
Physics.stackexchange.comCan someone explain LO-TO Splitting? - Physics Stack Exchange
WEBThis is in regards of 3 different optical modes separating. However, the phenomena Cardona is refers to involves polaritons. 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. I hope this is helpful.
Physics.stackexchange.com如何看待《自然》于2019年12月所刊论文中提到的新的热传导方 …
WEBDec 22, 2019 · 格波的激发单元因此可看是“粒子”,这个粒子化了的格波元激发(格波量子),或者说晶格振动的能量量子,称之为声子(phonon) 。频率为 \omega_s(q) 声子的能量为 \hbar\omega_s(q) 。声子是玻色子,服从玻色统计分布。
Zhihu.comWhat is exactly a phonon? - Physics Stack Exchange
WEBSep 17, 2016 · A phonon will be an eigenvector of this Hamiltonian. So it represents an excitation of the system (and if we want a link to the classical world, as it is an excitation of an ensemble of harmonic oscillators, it represents a wave travelling on the crystal). And because we have a wave function we can say that the phonon is a particle : if we do a
Physics.stackexchange.comWhat is the difference between a photon and a phonon?
WEBFor instance, in a spinless Bose-Einstein condensate, the NG boson is indeed a phonon, with a linear dispersion at low energy. However, in a ferromagnet the NG boson is called a magnon. This magnon is gapless but has a quadratic dispersion relation, like a massive particle, and should generally not be called a phonon.
Physics.stackexchange.comPhonon density of states - Physics Stack Exchange
WEBMay 2, 2020 · How can I easily calculate phonon density of states from phonon dispersion? I want to compare DOS of graphene and Si from phonon dispersion. Is there a better alternative to Debye DOS = $\\frac{w^2}
Physics.stackexchange.comsolid state physics - Do we say that phonon has effective mass …
WEBAug 1, 2018 · This figure shows the phonon dispersions of ZnO. It is clear that while some phonons have very roughly linear dispersions many do not (especially close to zone center). The second derivative would be non zero in these regions. I hope this has added to …
Physics.stackexchange.comDo gases have phonons? - Physics Stack Exchange
WEBMay 5, 2016 · A phonon is a quantized unit of sound; they are encountered when quantizing lattice vibrations in solids. Now, even an ideal gas supports sound waves, but in this case, interactions between atoms are weak. That makes it hard to imagine what a quantized vibration would look like, since at small scales, the particles are free!
Physics.stackexchange.comPhonon carries zero spin. Why? - Physics Stack Exchange
WEBSep 20, 2013 · But the phonon is a collective excitation, so any spin you would assign to it would have to come from its constituents, and the vibrations making up a phonon do not have angular momentum. Another thing that might be relevant: If memory serves, the tight connection between spin and polarization in photons is a consequence of their being …
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