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When you have a great number of interacting particles (such as electrons in a solid), it becomes impossible to try to describe each electron individually. We introduce the concept of quasiparticle to describe whan can be the low-lying excitations of the ensemble of particles. For instance, If you take a metal at 0K, the ground state of the system is the ...


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Think about the wave-particle mechanism in quantum mechanics. Everytime you have a wave travelling in a medium, you can think of it as a particle with a given propagation law (dispersion law). In the case of phonons, you can show that they propagate with the sound speed on the given medium. So, you can think of it as a particle (a set of variable values ...



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