A bipolaron is a concept in condensed matter physics that refers to a bound state of two polarons. A polaron is a quasiparticle that forms when an electron or hole interacts with the lattice structure of a material, leading to a distortion of the lattice around it. This distortion effectively modifies the electron's or hole's properties, such as its mass and mobility, due to the interaction with the surrounding lattice vibrations (phonons).
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