Exciton vs Plasmon
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Exciton
An exciton is a bound state of an electron and positively charged "hole" created when an electron transitions to a higher energy level in a material, effectively behaving as a quasi-particle with properties like mass and momentum.
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Plasmon
Plasmons are collective oscillations of the free electron gas density, often occurring at the surface of a metal when excited by light. These quasiparticles are fundamental to the field of plasmonics, which studies the interaction between electromagnetic radiation and conductive materials. Surface plasmon polaritons can confine light to subwavelength dimensions, making them useful for applications...
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