Charge Density Waves (CDWs) are collective electronic states in which the charge density in a material becomes periodically modulated in space. This modulation is often accompanied by a distortion of the crystal lattice. CDWs arise from strong interactions between electrons and lattice vibrations, particularly in low-dimensional materials. They represent a form of electronic ordering competing with superconductivity and magnetism. Charge density waves influence electrical conductivity and optical properties. They are observed in transition metal compounds and layered materials. Studying CDWs helps understand collective behavior and phase transitions in correlated systems. Charge density waves highlight the importance of electron–phonon coupling in condensed matter physics.
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