Origin of giant Rashba spin splitting in Bi/Ag surface alloys
Abstract
One-third of a monolayer of Bi alloyed into the Ag(111) surface yields a pair of Rashba spin-split free-electron-like surface states. The splitting in momentum space is the largest of all surface alloys investigated. Using first-principles calculations, we have determined the spin splitting in this system as a function of atomic corrugation of the top atomic layer and the strengths of the atomic spin-orbit coupling in Bi and Ag. The calculated splitting is proportional to the strengths of the atomic spin-orbit coupling, but it peaks at a certain surface corrugation parameter. These findings indicate that the observed giant spin splitting is caused by a near-optimal surface corrugation and a large atomic spin-orbit coupling in Bi. The results offer a useful guide for searching for two-dimensional systems with large surface spin effects.
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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 [133]
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References 29 · Cited by 45
- Authors
- Bian, G., Wang, X., Miller, T., & Chiang, T.-C.
- Affiliations
- University of Illinois Urbana-Champaign (US)
- Nanjing University of Science and Technology (CN)
- Venue
- Physical Review B
- Publisher
- American Physical Society (APS)
- Published
- 2013-08-21
- Volume
- 88
- Issue
- 8
- ISSN
- 1098-0121 (ISSN-L)
- 1550-235X
- OpenAlex
- W2323917602
- Cited by
- 45
- References
- 29
- Citations by year
- 2026: 3 · 2025: 5 · 2024: 2 · 2023: 3 · 2022: 1 · 2021: 2 · 2020: 3 · 2019: 6 · 2018: 3 · 2017: 3 · 2016: 5 · 2015: 5 · 2014: 4
- FWCI
- 2.39
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Physical Review B (publishedVersion)
- Funders
- National Science Foundation
- U.S. Department of Energy
- University of Wisconsin-Madison
- 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 › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Surface and Thin Film Phenomena
- Keywords
- Rashba spin splitting, surface alloys, surface states, surface corrugation
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