Quantum concentration is a term used in the context of quantum mechanics and condensed matter physics. It generally refers to the concentration of quantum particles (such as electrons, holes, or other quasi-particles) in a given system or material, particularly when considering their quantum mechanical properties. In various materials, especially those that are semiconductors or superconductors, the behavior and properties of these particles can differ significantly from their classical counterparts due to quantum effects.
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The translational concentration scale for a nonrelativistic particle in three dimensions, per internal state. It is the inverse cube of the thermal de Broglie wavelength. A classical component with number density and external one-particle energy has chemical potential . An additional internal degeneracy must be included explicitly; it is not hidden in this definition. The dilute classical condition is for each occupied internal component.