Mapping the intrinsic photocurrent streamlines through micromagnetic heterostructure devices

Photocurrent 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...

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Main Authors: Mayes, David, Farahmand, Farima, Grossnickle, Maxwell, Lohmann, Mark, Aldosary, Mohammed, Li, Junxue, Aji, Vivek, Shi, Jing, Song, Justin Chien Wen, Gabor, Nathaniel M.
Other Authors: School of Physical and Mathematical Sciences
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Language:English
Published: 2023
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Online Access:https://hdl.handle.net/10356/171684
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spelling sg-ntu-dr.10356-1716842023-11-06T15:35:01Z Mapping the intrinsic photocurrent streamlines through micromagnetic heterostructure devices Mayes, David Farahmand, Farima Grossnickle, Maxwell Lohmann, Mark Aldosary, Mohammed Li, Junxue Aji, Vivek Shi, Jing Song, Justin Chien Wen Gabor, Nathaniel M. School of Physical and Mathematical Sciences Science::Physics Photocurrent Magnetic Device Photocurrent 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. Ministry of Education (MOE) Published version This 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. 2023-11-06T01:01:15Z 2023-11-06T01:01:15Z 2023 Journal Article Mayes, 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-. https://dx.doi.org/10.1073/pnas.2221815120 0027-8424 https://hdl.handle.net/10356/171684 10.1073/pnas.2221815120 37722037 2-s2.0-85171696517 39 120 e2221815120 en MOE2018-T3-1-002 Proceedings of the National Academy of Sciences © 2023 the Author(s). Published by PNAS. This open access article is distributed under Creative Commons Attribution License 4.0 (CC BY). application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Science::Physics
Photocurrent
Magnetic Device
spellingShingle Science::Physics
Photocurrent
Magnetic Device
Mayes, David
Farahmand, Farima
Grossnickle, Maxwell
Lohmann, Mark
Aldosary, Mohammed
Li, Junxue
Aji, Vivek
Shi, Jing
Song, Justin Chien Wen
Gabor, Nathaniel M.
Mapping the intrinsic photocurrent streamlines through micromagnetic heterostructure devices
description Photocurrent 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.
author2 School of Physical and Mathematical Sciences
author_facet School of Physical and Mathematical Sciences
Mayes, David
Farahmand, Farima
Grossnickle, Maxwell
Lohmann, Mark
Aldosary, Mohammed
Li, Junxue
Aji, Vivek
Shi, Jing
Song, Justin Chien Wen
Gabor, Nathaniel M.
format Article
author Mayes, David
Farahmand, Farima
Grossnickle, Maxwell
Lohmann, Mark
Aldosary, Mohammed
Li, Junxue
Aji, Vivek
Shi, Jing
Song, Justin Chien Wen
Gabor, Nathaniel M.
author_sort Mayes, David
title Mapping the intrinsic photocurrent streamlines through micromagnetic heterostructure devices
title_short Mapping the intrinsic photocurrent streamlines through micromagnetic heterostructure devices
title_full Mapping the intrinsic photocurrent streamlines through micromagnetic heterostructure devices
title_fullStr Mapping the intrinsic photocurrent streamlines through micromagnetic heterostructure devices
title_full_unstemmed Mapping the intrinsic photocurrent streamlines through micromagnetic heterostructure devices
title_sort mapping the intrinsic photocurrent streamlines through micromagnetic heterostructure devices
publishDate 2023
url https://hdl.handle.net/10356/171684
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