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An in-plane photoelectric effect in two-dimensional electron systems for terahertz detection

Wladislaw Michailow Orcid Logo, Peter Spencer Orcid Logo, Nikita W. Almond Orcid Logo, Stephen J. Kindness Orcid Logo, Robert Wallis, Thomas A. Mitchell Orcid Logo, Riccardo Degl’Innocenti Orcid Logo, Sergey A. Mikhailov Orcid Logo, Harvey E. Beere Orcid Logo, David Ritchie Orcid Logo

Science Advances, Volume: 8, Issue: 15

Swansea University Author: David Ritchie Orcid Logo

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DOI (Published version): 10.1126/sciadv.abi8398

Abstract

Many mid- and far-infrared semiconductor photodetectors rely on a photonic response, when the photon energy is large enough to excite and extract electrons due to optical transitions. Toward the terahertz range with photon energies of a few milli–electron volts, classical mechanisms are used instead...

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Published in: Science Advances
ISSN: 2375-2548
Published: American Association for the Advancement of Science (AAAS) 2022
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URI: https://cronfa.swan.ac.uk/Record/cronfa60432
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This is the case in two-dimensional electron systems, where terahertz detection is dominated by plasmonic mixing and by scattering-based thermal phenomena. Here, we report on the observation of a quantum, collision-free phenomenon that yields a giant photoresponse at terahertz frequencies (1.9 THz), more than 10-fold as large as expected from plasmonic mixing. We artificially create an electrically tunable potential step within a degenerate two-dimensional electron gas. When exposed to terahertz radiation, electrons absorb photons and generate a large photocurrent under zero sourcedrain bias. 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spelling 2022-10-28T15:44:05.6706255 v2 60432 2022-07-09 An in-plane photoelectric effect in two-dimensional electron systems for terahertz detection e943ea127ff7b7771c2b27c15b96c6fa 0000-0002-9844-8350 David Ritchie David Ritchie true false 2022-07-09 SPH Many mid- and far-infrared semiconductor photodetectors rely on a photonic response, when the photon energy is large enough to excite and extract electrons due to optical transitions. Toward the terahertz range with photon energies of a few milli–electron volts, classical mechanisms are used instead. This is the case in two-dimensional electron systems, where terahertz detection is dominated by plasmonic mixing and by scattering-based thermal phenomena. Here, we report on the observation of a quantum, collision-free phenomenon that yields a giant photoresponse at terahertz frequencies (1.9 THz), more than 10-fold as large as expected from plasmonic mixing. We artificially create an electrically tunable potential step within a degenerate two-dimensional electron gas. When exposed to terahertz radiation, electrons absorb photons and generate a large photocurrent under zero sourcedrain bias. The observed phenomenon, which we call the “in-plane photoelectric effect,” provides an opportunity for efficient direct detection across the entire terahertz range. Journal Article Science Advances 8 15 American Association for the Advancement of Science (AAAS) 2375-2548 15 4 2022 2022-04-15 10.1126/sciadv.abi8398 Data and materials availability: All data needed to evaluate the conclusions in the paper are present in the paper and/or the Supplementary Materials. The data that support the findings of this study will be available in the Apollo repository of the University of Cambridge at https://doi.org/10.17863/CAM.58046 (65). COLLEGE NANME Physics COLLEGE CODE SPH Swansea University W.M. thanks the George and Lillian Schiff Studentship of the University of Cambridge for financial support and is grateful for the Honorary Vice-Chancellor’s Award of the Cambridge Trust. S.A.M. acknowledges funding from the European Union’s Horizon 2020 research and innovation program Graphene Core 3 under grant agreement no. 881603. R.D. acknowledges support from the EPSRC (grant no. EP/S019383/1). We acknowledge EPSRC funding under the HyperTerahertz grant (no. EP/P021859/1). 2022-10-28T15:44:05.6706255 2022-07-09T15:14:47.3921316 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Wladislaw Michailow 0000-0002-2573-9448 1 Peter Spencer 0000-0001-9435-427x 2 Nikita W. Almond 0000-0003-3548-129x 3 Stephen J. Kindness 0000-0002-0776-5896 4 Robert Wallis 5 Thomas A. Mitchell 0000-0001-8686-3226 6 Riccardo Degl’Innocenti 0000-0003-2655-1997 7 Sergey A. Mikhailov 0000-0003-0880-3249 8 Harvey E. Beere 0000-0001-5630-2321 9 David Ritchie 0000-0002-9844-8350 10 60432__24577__d2a059e365684152b8d7beb9979ce6aa.pdf 60432.pdf 2022-07-13T11:59:35.2368041 Output 545710 application/pdf Version of Record true Released under a Creative Commons Attribution License 4.0 (CC BY). true eng https://creativecommons.org/licenses/by/4.0/
title An in-plane photoelectric effect in two-dimensional electron systems for terahertz detection
spellingShingle An in-plane photoelectric effect in two-dimensional electron systems for terahertz detection
David Ritchie
title_short An in-plane photoelectric effect in two-dimensional electron systems for terahertz detection
title_full An in-plane photoelectric effect in two-dimensional electron systems for terahertz detection
title_fullStr An in-plane photoelectric effect in two-dimensional electron systems for terahertz detection
title_full_unstemmed An in-plane photoelectric effect in two-dimensional electron systems for terahertz detection
title_sort An in-plane photoelectric effect in two-dimensional electron systems for terahertz detection
author_id_str_mv e943ea127ff7b7771c2b27c15b96c6fa
author_id_fullname_str_mv e943ea127ff7b7771c2b27c15b96c6fa_***_David Ritchie
author David Ritchie
author2 Wladislaw Michailow
Peter Spencer
Nikita W. Almond
Stephen J. Kindness
Robert Wallis
Thomas A. Mitchell
Riccardo Degl’Innocenti
Sergey A. Mikhailov
Harvey E. Beere
David Ritchie
format Journal article
container_title Science Advances
container_volume 8
container_issue 15
publishDate 2022
institution Swansea University
issn 2375-2548
doi_str_mv 10.1126/sciadv.abi8398
publisher American Association for the Advancement of Science (AAAS)
college_str Faculty of Science and Engineering
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hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Physics{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Physics
document_store_str 1
active_str 0
description Many mid- and far-infrared semiconductor photodetectors rely on a photonic response, when the photon energy is large enough to excite and extract electrons due to optical transitions. Toward the terahertz range with photon energies of a few milli–electron volts, classical mechanisms are used instead. This is the case in two-dimensional electron systems, where terahertz detection is dominated by plasmonic mixing and by scattering-based thermal phenomena. Here, we report on the observation of a quantum, collision-free phenomenon that yields a giant photoresponse at terahertz frequencies (1.9 THz), more than 10-fold as large as expected from plasmonic mixing. We artificially create an electrically tunable potential step within a degenerate two-dimensional electron gas. When exposed to terahertz radiation, electrons absorb photons and generate a large photocurrent under zero sourcedrain bias. The observed phenomenon, which we call the “in-plane photoelectric effect,” provides an opportunity for efficient direct detection across the entire terahertz range.
published_date 2022-04-15T04:18:32Z
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score 11.013731

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