Non-local terahertz photoconductivity in the topological phase of Hg1−x Cd x Te

Abstract We report on observation of strong non-local photoconducitivity induced by terahertz laser pulses in non-zero magnetic field in heterostructures based on Hg1−x Cd x Te films being in the topological phase. While the zero-field non-local photoconductivity is negligible, it is strongly enhanc...

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Main Authors:	A. S. Kazakov, A. V. Galeeva, A. I. Artamkin, A. V. Ikonnikov, L. I. Ryabova, S. A. Dvoretsky, N. N. Mikhailov, M. I. Bannikov, S. N. Danilov, D. R. Khokhlov
Format:	article
Language:	EN
Published:	Nature Portfolio 2021
Subjects:	Medicine R Science Q
Online Access:	https://doaj.org/article/adf33367841b42fe8d92c092dde4ce50
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spelling	oai:doaj.org-article:adf33367841b42fe8d92c092dde4ce502021-12-02T14:12:45ZNon-local terahertz photoconductivity in the topological phase of Hg1−x Cd x Te10.1038/s41598-021-81099-62045-2322https://doaj.org/article/adf33367841b42fe8d92c092dde4ce502021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-81099-6https://doaj.org/toc/2045-2322Abstract We report on observation of strong non-local photoconducitivity induced by terahertz laser pulses in non-zero magnetic field in heterostructures based on Hg1−x Cd x Te films being in the topological phase. While the zero-field non-local photoconductivity is negligible, it is strongly enhanced in magnetic fields ~ 0.05 T resulting in appearance of an edge photocurrent that exceeds the respective dark signal by orders of magnitude. This photocurrent is chiral, and the chirality changes every time the magnetic field or the electric bias is reversed. Appearance of the non-local terahertz photoconductivity is attributed to features of the interface between the topological film and the trivial buffer.A. S. KazakovA. V. GaleevaA. I. ArtamkinA. V. IkonnikovL. I. RyabovaS. A. DvoretskyN. N. MikhailovM. I. BannikovS. N. DanilovD. R. KhokhlovNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q A. S. Kazakov A. V. Galeeva A. I. Artamkin A. V. Ikonnikov L. I. Ryabova S. A. Dvoretsky N. N. Mikhailov M. I. Bannikov S. N. Danilov D. R. Khokhlov Non-local terahertz photoconductivity in the topological phase of Hg1−x Cd x Te
description	Abstract We report on observation of strong non-local photoconducitivity induced by terahertz laser pulses in non-zero magnetic field in heterostructures based on Hg1−x Cd x Te films being in the topological phase. While the zero-field non-local photoconductivity is negligible, it is strongly enhanced in magnetic fields ~ 0.05 T resulting in appearance of an edge photocurrent that exceeds the respective dark signal by orders of magnitude. This photocurrent is chiral, and the chirality changes every time the magnetic field or the electric bias is reversed. Appearance of the non-local terahertz photoconductivity is attributed to features of the interface between the topological film and the trivial buffer.
format	article
author	A. S. Kazakov A. V. Galeeva A. I. Artamkin A. V. Ikonnikov L. I. Ryabova S. A. Dvoretsky N. N. Mikhailov M. I. Bannikov S. N. Danilov D. R. Khokhlov
author_facet	A. S. Kazakov A. V. Galeeva A. I. Artamkin A. V. Ikonnikov L. I. Ryabova S. A. Dvoretsky N. N. Mikhailov M. I. Bannikov S. N. Danilov D. R. Khokhlov
author_sort	A. S. Kazakov
title	Non-local terahertz photoconductivity in the topological phase of Hg1−x Cd x Te
title_short	Non-local terahertz photoconductivity in the topological phase of Hg1−x Cd x Te
title_full	Non-local terahertz photoconductivity in the topological phase of Hg1−x Cd x Te
title_fullStr	Non-local terahertz photoconductivity in the topological phase of Hg1−x Cd x Te
title_full_unstemmed	Non-local terahertz photoconductivity in the topological phase of Hg1−x Cd x Te
title_sort	non-local terahertz photoconductivity in the topological phase of hg1−x cd x te
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/adf33367841b42fe8d92c092dde4ce50
work_keys_str_mv	AT askazakov nonlocalterahertzphotoconductivityinthetopologicalphaseofhg1xcdxte AT avgaleeva nonlocalterahertzphotoconductivityinthetopologicalphaseofhg1xcdxte AT aiartamkin nonlocalterahertzphotoconductivityinthetopologicalphaseofhg1xcdxte AT avikonnikov nonlocalterahertzphotoconductivityinthetopologicalphaseofhg1xcdxte AT liryabova nonlocalterahertzphotoconductivityinthetopologicalphaseofhg1xcdxte AT sadvoretsky nonlocalterahertzphotoconductivityinthetopologicalphaseofhg1xcdxte AT nnmikhailov nonlocalterahertzphotoconductivityinthetopologicalphaseofhg1xcdxte AT mibannikov nonlocalterahertzphotoconductivityinthetopologicalphaseofhg1xcdxte AT sndanilov nonlocalterahertzphotoconductivityinthetopologicalphaseofhg1xcdxte AT drkhokhlov nonlocalterahertzphotoconductivityinthetopologicalphaseofhg1xcdxte
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Non-local terahertz photoconductivity in the topological phase of Hg1−x Cd x Te

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