Enhanced Terahertz Radiation by Efficient Spin-to-Charge Conversion in Rashba-Mediated Dirac Surface States
Abstract
The enhancement of terahertz (THz) radiation is of extreme significance for the realization of the THz probe and imaging. However, present THz technologies are far from being enough to realize high-performance and room-temperature THz sources. Fortunately, topological insulators (TIs), with spin-momentum-locked Dirac surface states, are expected to exhibit a high terahertz emission efficiency. In this work, the novel concept of a Rashba-state-enhanced spintronic THz emitter is demonstrated on the basis of ferromagnet/heavy metal/topological insulator (FM/HM/TI) heterostructure. We find that the THz emission intensity changes as a function of HM interlayer thickness, and a 1.98 times higher intensity compared to that of FM/TI can be achieved when a meticulously designed thickness of the HM layer is inserted. The improvement of terahertz radiation is ascribed to the additive effect of Rashba splitting and topological surface states at the HM/TI interface. These results offer new possibilities for realizing spintronic THz emitters in TI-based magnetic heterostructures.
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THz emission from the IREE has been demonstrated with topological insulators using FM/Bi/Bi2Te3 heterostructures.
“THz emission from the IREE has also been demonstrated with topological insulators using FM/Bi/Bi2Te3 heterostructures134.”
From Ultrafast terahertz emission from emerging symmetry-broken materials (2023) · cites this paper as [134]
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References 39 · Cited by 58
- Authors
- Tong, M., Hu, Y., Wang, Z., Zhou, T., Xie, X., Cheng, X., & Jiang, T.
- Affiliations
- National University of Defense Technology (CN)
- Beijing Academy of Quantum Information Sciences (CN)
- Corresponding author
- Jiang, Tian
- Venue
- Nano Letters
- Publisher
- American Chemical Society (ACS)
- Published
- 2020-12-17
- Volume
- 21
- Issue
- 1
- Pages
- 60-67
- ISSN
- 1530-6984 (ISSN-L)
- 1530-6992
- OpenAlex
- W3111595343
- Cited by
- 58
- References
- 39
- Citations by year
- 2026: 8 · 2025: 11 · 2024: 9 · 2023: 10 · 2022: 9 · 2021: 11
- FWCI
- 3.05
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- Nano Letters (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National University of Defense Technology (ZK18-01-03, ZK18-03-22, ZK18-03-36)
- Beijing Academy of Quantum Information Sciences (Y18G17)
- National Natural Science Foundation of China (11802339, 11804387, 11805276, 11902358, 12004434, 61801498, 61805282, 62075240)
- Topics
- 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
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Terahertz technology and applications
- Keywords
- spin-to-charge conversion, Rashba spin splitting, topological insulators, Dirac surface states, spintronic terahertz emitters, magnetic heterostructures, spin-momentum locking
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