Eli137 said:I am confused as to what a quasi particle is. I know that it only occurs when a microscopic system acts in an unorthodox way, but are they truly a particle? Are they fundamental? Have they been proven? If the answer to all of these questions is yes, why are they excluded from the standard model?
Quasiparticles are collective excitations that behave like particles in certain systems. They are not fundamental particles, but rather emergent phenomena that arise from interactions between particles in a material or system.
Some examples of quasiparticles include phonons, which are collective excitations of atoms in a solid; polaritons, which are a combination of photons and phonons in a solid; and magnons, which are collective excitations of electron spins in a magnetic material.
Quasiparticles are different from real particles in that they are not fundamental entities with their own unique properties. Instead, they behave like particles within a specific system or material, and their properties are dependent on the interactions between the constituent particles.
Quasiparticles play a crucial role in understanding the behavior of complex systems, such as solids and liquids. They provide a way to describe and analyze the collective behavior of particles in these systems, and their study has led to important insights and advancements in condensed matter physics.
Quasiparticles have important technological applications, particularly in the fields of electronics and photonics. For example, polaritons have been used to create new types of lasers, and magnons are being explored for use in spintronics devices. Understanding quasiparticles is essential for developing new technologies and materials.