Publication Date:
2018-03-29
Description:
Terahertz photoconductivity in heterostructures based on n-type Hg1− x Cd x Te 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.
Electronic ISSN:
2190-4286
Topics:
Chemistry and Pharmacology
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Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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Physics
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Technology
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