Scaling law for Rashba-type spin splitting in quantum-well films
Abstract
We use laser-based spin- and angle-resolved photoemission spectroscopy (laser-SARPES) with high resolution and experimentally determine, for the first time, the Rashba parameters of quantum-well states (QWSs) systematically changing with the film thickness and the quantum numbers, through the observation of the Ag films grown on an Au(111) substrate. The data are very well reproduced by the theoretical calculations based on the density functional theory. Most importantly, we find a scaling law for the Rashba parameter (α_R) that the magnitude of α_R is scaled by the charge density at the interface and the spin-orbit coupling ratio between the film and the substrate, and it is expressed by a single straight line regardless of the film thickness and the quantum numbers. The new finding not only is crucial to understand the Rashba effect in QWSs but also gives a foundation of film growth engineering to fine-tune the spin splitting in 2D heterostructure systems.
Additional Information
© 2021 American Physical Society. Received 18 December 2020; revised 29 May 2021; accepted 28 October 2021; published 22 November 2021. This work was supported by the JSPS KAKENHI (Grants No. JP21H04439, No. JP25220707, No. JP18H01165, No. JP18K03484, No. JP19H02683, No. JP19F19030, and No. JP19H00651) and by MEXT Q-LEAP (Grant No. JPMXS0118068681). This work was also supported by MEXT as "Program for Promoting Researches on the Supercomputer Fugaku" (Basic Science for Emergence and Functionality in Quantum Matter Innovative Strongly Correlated Electron Science by Integration of "Fugaku" and Frontier Experiments) (Project ID: hp200132). R.N. acknowledges support by JSPS under KAKENHI Grant No. JP18J21892 and support by JSPS through the Program for Leading Graduate Schools (ALPS).Attached Files
Published - PhysRevB.104.L180409.pdf
Accepted Version - 2012.11289.pdf
Supplemental Material - Noguchi_AgAu_SI_TK_v2_RN.pdf
Files
Additional details
- Eprint ID
- 112892
- Resolver ID
- CaltechAUTHORS:20220113-874099100
- JP21H04439
- Japan Society for the Promotion of Science (JSPS)
- JP25220707
- Japan Society for the Promotion of Science (JSPS)
- JP18H01165
- Japan Society for the Promotion of Science (JSPS)
- JP18K03484
- Japan Society for the Promotion of Science (JSPS)
- JP19H02683
- Japan Society for the Promotion of Science (JSPS)
- JP19F19030
- Japan Society for the Promotion of Science (JSPS)
- JP19H00651
- Japan Society for the Promotion of Science (JSPS)
- JPMXS0118068681
- Ministry of Education, Culture, Sports, Science and Technology (MEXT)
- JP18J21892
- Japan Society for the Promotion of Science (JSPS)
- Created
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2022-01-13Created from EPrint's datestamp field
- Updated
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2022-01-13Created from EPrint's last_modified field