"Metal films." . . "Transition temperature." . . "Solid state physics." . . "Solid State Physics." . "Doping." . . "Lasers." . . "Light emitting diodes." . . "Substrates." . . . "Theoretical Problems in Solid State and Low Temperature Physics"@en . . . . "Areas of research include (1) theory of vortex motion in pure type II superconductors, (2) nonequilibrium problems associated with current flow across superconducting-normal boundaries, (3) a theoretical model for study of the study of the exciton mechanism for superconductivity consisting of a very thin metallic film on the surface of a semiconductor, (4) theory of enhanced conductivity above the Peierls transition temperature from charge density wave fluctuations in psuedo-one-dimensional conductors and (5) theory of the electronic structure and optical properties of semiconductors, with emphasis on ternary alloys of III-V compounds doped with nitrogen important for light emitting diodes and lasers. (Author)."@en . . . . . . . . . . . . . . . . . . . "ILLINOIS UNIV AT URBANA-CHAMPAIGN Dept. of PHYSICS." . . "Thin films." . . "Electric current." . . "Nitrogen." . . "Semiconductors." . . "Superconductivity." . . "Vortices." . . "Ternary compounds." . . . . "Electricity and Magnetism." . . "Excitons." . . "Interfaces." . .