We report the observation of negative absolute mobility of electrons (i.e., a drift toward the negative electrode) in $p$-modulation-doped GaAs quantum wells. This unusual effect results from "carrier drag" on the electrons by the high-mobility hole plasma via electron-hole scattering.

• Received 21 March 1986

DOI:https://doi.org/10.1103/PhysRevLett.56.2736