Infrared magneto-spectroscopy of narrow bandgap metamorphic InAs$_{\mathrm{1-x}}$Sb$_{\mathrm{x}}$

Metamorphic InAsSb alloys are a promising narrow gap semiconductor with bandgaps as low as 0.12eV, corresponding to approximately 10$\mu$m, much smaller either InAs or InSb. The effect of bowing on the reduction in the bandgap over its binary counterparts is not completely understood. Here, we report on the systematic low-temperature infrared magneto- absorption study of a series of InAs$_{\mathrm{x-1}}$Sb$_{\mathrm{x}}$ layers with varying Sb concentration performed in magnetic fields up to 17.5 T. Several cyclotron resonance series, including interband transitions, are observed. These results allow us to extract and compare the bowing coefficients for the effective mass and bandgap.