An in-plane photoelectric effect in two-dimensional electron systems for terahertz detection.
American Association for the Advancement of Science
MetadataShow full item record
Michailow, W., Spencer, P., Almond, N. W., Kindness, S. J., Wallis, R., Mitchell, T. A., Degl'Innocenti, R., et al. (2022). An in-plane photoelectric effect in two-dimensional electron systems for terahertz detection.. Sci Adv, 8 (15) https://doi.org/10.1126/sciadv.abi8398
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.
cond-mat.mes-hall, cond-mat.mes-hall, physics.app-ph, physics.optics
Engineering and Physical Sciences Research Council (EP/P021859/1)
European Commission Horizon 2020 (H2020) Future and Emerging Technologies (FET) (881603)
External DOI: https://doi.org/10.1126/sciadv.abi8398
This record's URL: https://www.repository.cam.ac.uk/handle/1810/337224
Attribution-NonCommercial 4.0 International
Licence URL: https://creativecommons.org/licenses/by-nc/4.0/
Recommended or similar items
The current recommendation prototype on the Apollo Repository will be turned off on 03 February 2023. Although the pilot has been fruitful for both parties, the service provider IKVA is focusing on horizon scanning products and so the recommender service can no longer be supported. We recognise the importance of recommender services in supporting research discovery and are evaluating offerings from other service providers. If you would like to offer feedback on this decision please contact us on: email@example.com