Broadband Terahertz Generation via the Interface Inverse Rashba-Edelstein Effect
Open accessAbstract
Novel mechanisms for electromagnetic wave emission in the terahertz frequency regime emerging at the nanometer scale have recently attracted intense attention for the purpose of searching next-generation broadband THz emitters. Here, we report broadband THz emission, utilizing the interface inverse Rashba-Edelstein effect. By engineering the symmetry of the Ag/Bi Rashba interface, we demonstrate a controllable THz radiation (∼0.1-5 THz) waveform emitted from metallic Fe/Ag/Bi heterostructures following photoexcitation. We further reveal that this type of THz radiation can be selectively superimposed on the emission discovered recently due to the inverse spin Hall effect, yielding a unique film thickness dependent emission pattern. Our results thus offer new opportunities for versatile broadband THz radiation using the interface quantum effects.
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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 [55]
Split into 2 atoms — 1 confirmed, 1 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.
Experimental — accuracy not yet measuredThe 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 [55]
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 [55]
The emitted THz amplitude is highly sensitive to the thickness of the Bi layer, likely due to decay of the injected spin current and multiple reflection effects.
“the emitted THz amplitude was found to be highly sensitive to the thickness of the Bi layer55. This is likely due to effects such as the decay of the injected spin current and multiple reflection effects when it makes up the second and third layers, respectively.”
From Ultrafast terahertz emission from emerging symmetry-broken materials (2023) · cites this paper as [55]
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- Authors
- Zhou, C., Liu, Y. P., Wang, Z., Ma, S. J., Jia, M. W., Wu, R. Q., Zhou, L., Zhang, W., Liu, M. K., Wu, Y. Z., & Qi, J.
- Affiliations
- Fudan University (CN)
- University of Electronic Science and Technology of China (CN)
- University of California, Irvine (US)
- Oakland University (US)
- Stony Brook University (US)
- Venue
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Published
- 2018-08-20
- Volume
- 121
- Issue
- 8
- Pages
- 086801-086801
- ISSN
- 0031-9007 (ISSN-L)
- 1079-7114
- OpenAlex
- W2796822350
- Cited by
- 199
- References
- 51
- Citations by year
- 2026: 22 · 2025: 28 · 2024: 28 · 2023: 20 · 2022: 33 · 2021: 31 · 2020: 20 · 2019: 14 · 2018: 3
- FWCI
- 6.51
- Type
- journal article
- Language
- en
- Open access
- green
- arxiv.org
- Licence
- Locations
- Physical Review Letters (publishedVersion)
- PubMed (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
- arXiv (Cornell University)
- Funders
- National Natural Science Foundation of China (11734006, 11474066, 11434003, 11674068, 11734007, 11474056)
- Fudan University
- U.S. Department of Energy (DE-FG02-05ER46237)
- National Key Basic Research Program of China (2015CB921401)
- National Key Research and Development Program of China (2016YFA030070, 2017YFA0303504)
- Science Challenge Program of China (TZ2016004)
- Program of Shanghai Academic Research Leader (17XD1400400)
- Topics
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Terahertz technology and applications
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Magnetic properties of thin films
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Topological Materials and Phenomena
- Keywords
- terahertz emission, inverse Rashba-Edelstein effect, inverse spin Hall effect, photoexcitation, film thickness dependence, spintronics
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