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Results tagged with phonons
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user 16873
Collective excitations in periodic, elastic arrangements of atoms or molecules in condensed matter, like solids and some liquids. They are quasiparticle quantum modes of vibration of elastic structures of interacting particles.
10
votes
1
answer
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Lagrangian of 2D square lattice of point masses connected by springs
I know this is the abc of solid state physics, that gives rise to the phonons and other interesting stuff, but I am almost completely ignorant in that area. …
- 431
3
votes
4
answers
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What is the mathematical justification for the quadratic approximation to the energy of a sp...
It follows easily from this draw, the length $l$ of this spring as a function of the vertical distance $x$, as $l(x)=\sqrt{1+x^{2}}$
Now, $l$ can be expressed as a MacLaurin expansion:
$$l(x) = 1+ …
- 431