Georgi Nadjakov (December 26, 1896 - February 24, 1981) is a famous Bulgarian physicist. He became a corresponding member of the Göttingen Academy of Sciences (1940), member of the Bulgarian Academy of Sciences (1945) and member of the Russian Academy of Sciences (1958).
Sofia University sent him to specialise in the laboratories of Paul Langevin and Marie Curie in Paris, where he investigated photoelectricity for one year.
Georgi Nadjakov investigated experimentally photoconducting properties of sulphur. He prepared permanent photoelectret state of matter for the first time and published his paper in 1937 [1] and 1938.[2] He called electret founded by Egguchi thermoelectret and the electret, founded by him photoelectret.[3]
Photoelectrets were the most considerable result of Goergi Nadjakov. One of its practical application led to the invention of the photocopier by Chester Carlson some years latter.
Nadjakov Glacier on Graham Land in Antarctica is named after Georgi Nadjakov.