Control of Terahertz Emission by Ultrafast Spin-Charge Current Conversion at Rashba Interfaces
Abstract
We show that a femtosecond spin-current pulse can generate terahertz (THz) transients at Rashba interfaces between two nonmagnetic materials. Our results unambiguously demonstrate the importance of the interface in this conversion process that we interpret in terms of the inverse Rashba Edelstein effect, in contrast to the THz emission in the bulk conversion process via the inverse spin-Hall effect. Furthermore, we show that at Rashba interfaces the THz-field amplitude can be controlled by the helicity of the light. The optical generation of electric photocurrents by these interfacial effects in the femtosecond regime will open up new opportunities in ultrafast spintronics.
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Free charge currents are generated when pure spin currents are converted to charge currents, occurring in inverse effects at interfaces between magnetic and non-magnetic materials such as the inverse spin Hall and inverse Rashba-Edelstein effects.
“This can occur in a variety of inverse effects at interfaces between magnetic and non-magnetic materials, as with the inverse spin Hall53 and inverse Rashba-Edelstein54,55 effects.”
From Ultrafast terahertz emission from emerging symmetry-broken materials (2023) · cites this paper as [54]
The inverse spin-orbit torque effect occurs directly at interfaces of magnetic heterostructures.
“One instance of this is the inverse spin-orbit torque effect, which occurs directly at interfaces of magnetic heterostructures54,55.”
From Ultrafast terahertz emission from emerging symmetry-broken materials (2023) · cites this paper as [54]
Femtosecond optical pumping has yielded charge currents capable of driving THz emission in FM/Bi/Ag heterostructures due to intrinsically large spin splitting in Ag/Bi interfaces.
“femtosecond optical pumping has recently yielded charge currents capable of driving THz emission in FM/Bi/Ag heterostructures54,55, schematically represented in Fig. 5c. This is due to the intrinsically large spin splitting in Ag/Bi interfaces133.”
From Ultrafast terahertz emission from emerging symmetry-broken materials (2023) · cites this paper as [54]
Similar THz emission has been observed in FeRh/Pt heterostructures and in FM/NM/NM heterostructures used in IREE investigations, but was conspicuously absent in FM/NM control devices.
“Similar THz emission has been observed in FeRh/Pt heterostructures138 as well as the FM/NM/NM heterostructures used in investigations of the IREE, but were conspicuously absent in FM/NM control devices54.”
From Ultrafast terahertz emission from emerging symmetry-broken materials (2023) · cites this paper as [54]
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- Authors
- Jungfleisch, M. B., Zhang, Q., Zhang, W., Pearson, J. E., Schaller, R. D., Wen, H., & Hoffmann, A.
- Affiliations
- Argonne National Laboratory (US)
- Northwestern University (US)
- ORCID
- Venue
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Published
- 2018-05-18
- Volume
- 120
- Issue
- 20
- Pages
- 207207-207207
- ISSN
- 0031-9007 (ISSN-L)
- 1079-7114
- OpenAlex
- W2803153679
- Cited by
- 189
- References
- 34
- Citations by year
- 2026: 18 · 2025: 29 · 2024: 24 · 2023: 20 · 2022: 26 · 2021: 23 · 2020: 24 · 2019: 18 · 2018: 7
- FWCI
- 8.33
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- Physical Review Letters (publishedVersion)
- PubMed (publishedVersion)
- OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
- Funders
- U.S. Department of Energy (DE-AC02-06CH11357, DE-SC0012509)
- Basic Energy Sciences
- Office of Science, Materials Science and Engineering Division
- Topics
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Magnetic properties of thin films
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Terahertz technology and applications
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Laser-Matter Interactions and Applications
- Keywords
- terahertz emission, spin current generation, inverse Rashba-Edelstein effect, inverse spin Hall effect, ultrafast spintronics, non-magnetic materials
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