Nonlocal Photoresponse in Epitaxial Hg1-xCdxTe films with the inverted band structure

Abstract

We present results on non-local terahertz photoconductivity in Hg1-xCdxTe thick epitaxial films with the inverted energy spectrum $(\mathrm{x}\lt \sim 0.16)$. We show that the phototransport features observed in magnetic field indicate realization of the nonlocal electron transport regime, which is inherent to 2D topological insulators. We discuss the results in terms of a qualitative model that takes into account coexistence of the bulk transport and boundary conductive channels.