In condensed matter physics, Coulomb drag (also called electron drag or current drag) refers a transport phenomenon between two spatially isolated electrical conductors, where passing a steady electric current through one of them induces a voltage difference in the other.
It is named after the Coulomb interaction between charge carriers (usually electrons) responsible for the effect.
[2][3] The first experimental verification of the phenomena was carried between 1991 and 1992 in two-dimensional electron gases by the group of James P. Eisenstein working with gallium arsenide (GaAs) double quantum wells.
[2][6] When spin-polarized currents are involved, it is termed spin Coulomb drag.
For ballistic conduction, it is expected that the resistance is RD to be proportional to the temperature squared T 2.