Abstract
The electric field of light induces-in a noncentrosymmetric insulator-a dc current, quadratic in the field magnitude, called the "shift current." When addressed from a many-electron viewpoint, the shift current has a simple explanation and a simple formulation as well, deeply rooted in quantum geometry. The basic formula is then specialized to the independent-electron case, first for a disordered system in a supercell formulation, and then for a crystalline system. In the latter case the known shift-current formula is retrieved in a very transparent way.
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