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dc.contributor.authorMayes, Daviden_US
dc.contributor.authorFarahmand, Farimaen_US
dc.contributor.authorGrossnickle, Maxwellen_US
dc.contributor.authorLohmann, Marken_US
dc.contributor.authorAldosary, Mohammeden_US
dc.contributor.authorLi, Junxueen_US
dc.contributor.authorAji, Viveken_US
dc.contributor.authorShi, Jingen_US
dc.contributor.authorSong, Justin Chien Wenen_US
dc.contributor.authorGabor, Nathaniel M.en_US
dc.identifier.citationMayes, D., Farahmand, F., Grossnickle, M., Lohmann, M., Aldosary, M., Li, J., Aji, V., Shi, J., Song, J. C. W. & Gabor, N. M. (2023). Mapping the intrinsic photocurrent streamlines through micromagnetic heterostructure devices. Proceedings of the National Academy of Sciences, 120(39), e2221815120-.
dc.description.abstractPhotocurrent in quantum materials is often collected at global contacts far away from the initial photoexcitation. This collection process is highly nonlocal. It involves an intricate spatial pattern of photocurrent flow (streamlines) away from its primary photoexcitation that depends sensitively on the configuration of current collecting contacts as well as the spatial nonuniformity and tensor structure of conductivity. Direct imaging to track photocurrent streamlines is challenging. Here, we demonstrate a microscopy method to image photocurrent streamlines through ultrathin heterostructure devices comprising platinum on yttrium iron garnet (YIG). We accomplish this by combining scanning photovoltage microscopy with a uniform rotating magnetic field. Here, local photocurrent is generated through a photo-Nernst type effect with its direction controlled by the external magnetic field. This enables the mapping of photocurrent streamlines in a variety of geometries that include conventional Hall bar-type devices, but also unconventional wing-shaped devices called electrofoils. In these, we find that photocurrent streamlines display contortion, compression, and expansion behavior depending on the shape and angle of attack of the electrofoil devices, much in the same way as tracers in a wind tunnel map the flow of air around an aerodynamic airfoil. This affords a powerful tool to visualize and characterize charge flow in optoelectronic devices.en_US
dc.description.sponsorshipMinistry of Education (MOE)en_US
dc.relation.ispartofProceedings of the National Academy of Sciencesen_US
dc.rights© 2023 the Author(s). Published by PNAS. This open access article is distributed under Creative Commons Attribution License 4.0 (CC BY).en_US
dc.titleMapping the intrinsic photocurrent streamlines through micromagnetic heterostructure devicesen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Physical and Mathematical Sciencesen_US
dc.description.versionPublished versionen_US
dc.subject.keywordsMagnetic Deviceen_US
dc.description.acknowledgementThis work was supported by the Presidential Early Career Award for Scientists and Engineers through the Air Force Office of Scientific Research award no. FA9550- 20- 1- 0097 (D.M. and N.M.G.), through support from the NSF Division of Materials Research CAREER award no. 1651247 (D.M., F.F., M.G., and N.M.G.), through support from the Army Research Office Electronics Division Award no. W911NF2110260 (F.F., V.A., and N.M.G.). D.M., M.G., M.L., M.A., J.L., and J.S., were supported as part of the SHINES, an Energy Frontier Research Center funded by the US Department of Energy, Office of Science, Basic Energy Sciences under Award No. SC0012670. J.C.W.S. acknowledges support from the Singapore Ministry of Education Academic Research Fund Tier 3 Grant MOE2018-T3-1-002.en_US
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