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dc.contributor.authorMichailow, Wladislaw
dc.contributor.authorSpencer, Peter
dc.contributor.authorAlmond, Nikita W
dc.contributor.authorKindness, Stephen J
dc.contributor.authorWallis, Robert
dc.contributor.authorMitchell, Thomas A
dc.contributor.authorDegl’Innocenti, Riccardo
dc.contributor.authorMikhailov, Sergey A
dc.contributor.authorBeere, Harvey E
dc.contributor.authorRitchie, David A
dc.description.abstract<jats:p>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 source-drain bias. The observed phenomenon, which we call the “in-plane photoelectric effect,” provides an opportunity for efficient direct detection across the entire terahertz range.</jats:p>
dc.description.sponsorshipGeorge and Lilian Schiff Studentship, Schiff Foundation, University of Cambridge Honorary Vice-Chancellor’s Award, Cambridge Trust, University of Cambridge
dc.publisherAmerican Association for the Advancement of Science (AAAS)
dc.rightsAttribution 4.0 International
dc.titleAn in-plane photoelectric effect in two-dimensional electron systems for terahertz detection
dc.publisher.departmentTrinity College
prism.publicationNameScience Advances
dc.contributor.orcidMichailow, Wladislaw [0000-0002-2573-9448]
dc.contributor.orcidSpencer, Peter [0000-0001-9435-427X]
dc.contributor.orcidAlmond, Nikita W [0000-0003-3548-129X]
dc.contributor.orcidKindness, Stephen J [0000-0002-0776-5896]
dc.contributor.orcidMitchell, Thomas A [0000-0001-8686-3226]
dc.contributor.orcidDegl’Innocenti, Riccardo [0000-0003-2655-1997]
dc.contributor.orcidMikhailov, Sergey A [0000-0003-0880-3249]
dc.contributor.orcidBeere, Harvey E [0000-0001-5630-2321]
dc.contributor.orcidRitchie, David A [0000-0002-9844-8350]
rioxxterms.typeJournal Article/Review
pubs.funder-project-idEngineering and Physical Sciences Research Council (EP/P021859/1)
pubs.funder-project-idEuropean Commission Horizon 2020 (H2020) Future and Emerging Technologies (FET) (881603)
cam.orpheus.success2022-04-19: VoR added to Apollo record
pubs.licence-display-nameApollo Repository Deposit Licence Agreement

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Attribution 4.0 International
Except where otherwise noted, this item's licence is described as Attribution 4.0 International