Nonlinear magneto-optical spectroscopy of Hg1−xCdxTe by two-photon absorption techniques

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Abstract
In this paper we present new and important results on Hg1−xCdxTe alloys using CO2 laser-based magneto-optical methods that include (i) the observation and analysis of two-photon magnetoabsorption spectra in a variety of samples from x≂0.24 to 0.30, and (ii) the observation of magneto-optical transitions of electrons from both midgap levels and shallow acceptor levels to the conduction-band Landau levels. These measurements allow the most accurate determination of the energy gap and binding energies associated with impurities and defects. In addition, analysis of the temperature dependence of two-photon spectra obtained on all samples investigated reveals a nonlinear variation of the energy gap versus temperature not previously reported. The temperature dependence of the energy gap below 100 K cannot be explained by any of the currently used empirical relationships. The laser-based magneto-optical techniques we present here for Hg1−xCdxTe are generic and can easily be applied to other semiconductor or superlattice systems by using an appropriate combination of laser sources and magnetic fields.

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