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Session Q14 - DCMP: SEMICONDUCTORS: MAGNETISM
Mixed session, Friday morning, March 24, 8:00
Room J4, San Jose Convention Center
Galvanomagnetic luminescence of p-type InSb was investigated as a function of current density in fields up to 1.8 tesla. At negative current densities beyond 600 A cm^-2 at 1 T, the intensity saturates, which corresponds to the complete suppression of ordinary 300 K thermal emission at wavelengths less than 7.5 micrometers. This maximum value of negative luminescence, 3.5 mW cm^-2 , calibrates the radiance scale. For positive current polarity, the luminescence is a non-linear function of both current density and magnetic field, reaching values of 240 mW cm^-2 at 1.2 T, at the maximum value of current applied. The corresponding current density is not precisely known, due to non-uniform current density, but is above 4,000 A cm^-2 . The relatively complicated current and magnetic field dependences of the luminescence are interpreted by extrapolating from the well-understood linear low current regime.
Supported by the U.S. D.O.E. under Contract No. DE-AC03-76SF00098.