1. Non-equilibrium electron transport induced by terahertz radiation in the topological and trivial phases of Hg1−xCdxTe
- Author
-
Sergey Danilov, Sergey A. Dvoretskiy, A. I. Artamkin, Dmitry Khokhlov, Alexey S. Kazakov, Nikolay N. Mikhailov, Ludmila I. Ryabova, and A. V. Galeeva
- Subjects
Letter ,Materials science ,Terahertz radiation ,Dirac (software) ,General Physics and Astronomy ,02 engineering and technology ,lcsh:Chemical technology ,Topology ,Epitaxy ,lcsh:Technology ,01 natural sciences ,Condensed Matter::Materials Science ,terahertz radiation ,Phase (matter) ,0103 physical sciences ,Nanotechnology ,photoconductivity ,lcsh:TP1-1185 ,General Materials Science ,Electrical and Electronic Engineering ,lcsh:Science ,010306 general physics ,topological insulator ,lcsh:T ,Condensed Matter::Other ,Photoconductivity ,Heterojunction ,Condensed Matter::Mesoscopic Systems and Quantum Hall Effect ,021001 nanoscience & nanotechnology ,Electron transport chain ,lcsh:QC1-999 ,Nanoscience ,Topological insulator ,lcsh:Q ,0210 nano-technology ,lcsh:Physics - Abstract
Terahertz photoconductivity in heterostructures based on n-type Hg1−xCdxTe epitaxial films both in the topological phase (x < 0.16, inverted band structure, zero band gap) and the trivial state (x > 0.16, normal band structure) has been studied. We show that both the positive photoresponse in films with x < 0.16 and the negative photoconductivity in samples with x > 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.
- Published
- 2018
- Full Text
- View/download PDF