 He pioneered the concept of spontaneous symmetry breaking in the physics of elementary particles, 
discovered collective pinning of magnetic flux in superconductors, 
predicted paraconductivity 
and effects of fluctuations on properties of superconductors,
made essential contributions to the theory of weak localization, 
as well as developed the concept of the Ehrenfest time 
and its effect on phenomena of quantum chaos.A.I.Larkin was the famous teacher of a large number of actively working theorists.