Gregory Evgenievich (Ezekielevich) Pikus (May 7, 1923 – April 12, 1998) was a Soviet theoretical physicist whose contributions strongly influenced developing physics of semiconductors.
Pikus's deep feeling on the role of symmetry developed during his work with Bir on the effect of anisotropic deformations on energy spectrum and physical propertied of semiconductors, a controversial subject at that time.
In the future, this approach guided prediction of the photogalvanic effect, developing of a nondissipative electric current in homogeneous gyrotropic crystals under their illumination by circularly polarized light.
In the late period of his life, Pikus concentrated on developing a consistent theory of the weak localization corrections to magnetoconductivity of spin-orbit coupled media.
Around Pikus grew a new generation of young theorists including such researchers as Gennady Bir, Arkady Aronov, and Eugene Ivchenko.