Abstract
Abstract High field oscillatory magnetoreflection measurements performed in crystals of Cd3As2 at liquid helium temperatures have yielded an energy gap Eg = 0.048 eV, and a reduced effective mass m ∗ = 0.092 mo. The absence of a low energy cut-off indicates that no carriers are present in these bands. Nevertheless, Hall measurements on these samples yield a carrier concentration of 3 × 1018/cm3 between 4.2°K and 300°K. These results suggest that these carriers, which have also been observed in other experiments, must be located elsewhere in the Brillouin zone. The coincidence of the band gap with the plasma frequency indicates that interband effects are important in the interpretation of the magneto-plasma effects.
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