Lars Tore Hedin was born in
Örebro,
Sweden in 1930, son of engineers. He studied undergraduate physics in
KTH Royal Institute of Technology, obtaining a master's degree in 1955. which later became known as the
GW approximation, where
G is the many-body
Green's function and
W the screened interaction term. The equations that he developed are called the Hedin equations. The
GW approximation became a competitor theory for
density functional theory, also developed about the same time. The same year, Hedin became professor at
Linköping University, but the year afterward he accepted a professorship at
Lund University where he stablished his own group. In 1994, he accepted the four year position of director of the
Max Planck Institute for Solid State Research in
Stuttgart, Germany. He returned to Lund University as emeritus. Hedin used his
GW method to study
photoemission. He called this theory the 'blue electron theory', which he explained as Hedin also worked in
X-ray absorption fine structure (XAFS), introducing the
local density approximation for the GW self energy. Hedin was editor of
Solid State Communications from 1971 to 1990.
Personal life He married his wife Hillevi in 1953. They had three daughters. == References ==