The positive electron mobility relates the drift velocity of conduction electrons to an electric field: . In the isotropic Drude model, , where is the momentum relaxation time and the band effective mass. The minus sign describes negative charge; the electron mobility itself is positive.
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Electron mobility refers to the ability of electrons to move through a material when subjected to an electric field. It is a crucial parameter in understanding the electrical properties of semiconductors and conductors. Mobility is typically denoted by the symbol \( \mu \) and is defined as the proportionality constant between the drift velocity of charge carriers (in this case, electrons) and the electric field applied.