PT Journal AU Il’in, KS Milostnaya, II Verevkin, AA Gol’tsman, GN Gershenzon, EM Sobolewski, R TI Ultimate quantum efficiency of a superconducting hot-electron photodetector SO Applied physics letters PY 1998 BP 3938 EP 3940 VL 73 IS 26 DI 10.1063/1.122942 LA english ER