A plasmon is a quantum of a collective oscillation of electric charge density in a plasma or conducting material. Long-range Coulomb interaction can give its long-wavelength longitudinal mode a nonzero frequency.
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A plasmon is a quantum of collective oscillation of free electrons in a material, particularly in metals. These oscillations can occur in response to electromagnetic fields, and they play a crucial role in several phenomena and technologies, including: 1. **Surface Plasmons**: These are coherent oscillations of electrons at the interface between a metal and a dielectric (non-conducting material).