Far-infrared resonant photoconductivity in indium antimonide

A narrow-band photoconductive effect has been observed in indium antimonide in a high magnetic field at 4.2°K. The resonant frequency of this effect depends on the magnetic field strength and measurements have been made between 1000 and 26 μm with fields up to 75 kG. At the shorter wavelengths fine structure is observed in the photoconductivity. The resonance is attributed to transitions between impurity states bound to conduction band Landau levels. Good agreement between existing theories and the observed results give a conduction band effective mass of m^* = 0.0148 m₀.