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Terahertz photoconductivity in heterostructures based on n-type Hg 1-   x  Cd  x  Te epitaxial films both in the topological phase ( x &lt; 0.16, inverted band structure, zero band gap) and the trivial state ( x &gt; 0.16, normal band structure) has been studied. We show that both the positive photoresponse in films with x &lt; 0.16 and the negative photoconductivity in samples with x &gt; 0.16 have no low-energy threshold. The observed non-threshold positive photoconductivity is discussed in terms of a qualitative model that takes into account a 3D potential well and 2D topological Dirac states coexisting in a smooth topological heterojunction.

beilstein journal of nanotechnology

Non-equilibrium electron transport induced by terahertz radiation in the topological and trivial phases of Hg1−xCdxTe