Rashba states have been actively revisited as a platform for advanced applications such as spintronics and topological quantum computation. Yet, access to the Rashba state is restricted to the specific material sets, and the methodology to control the Rashba state is not established. Here, we report the Rashba states on the (001) surface of KZnBi, a 3D Dirac semimetal. Using angle-resolved photoemission spectroscopy and first-principles calculations, we investigated the evolution of Rashba states under different surface conditions controlled by alkali metal deposition. We observed that restoring surface ordering enables a Rashba state, which is absent in freshly cleaved surfaces. Interestingly, we were able to modify the dispersion of the Rashba state from an ordinary parabolic dispersion to a linearly dispersing Dirac-like state by additional alkali-metal deposition. Our findings provide a methodology for engineering the properties of Rashba states for advanced applications and redefine topological systems as generic hosts of Rashba states.
This work was supported by the Korea Research Institute of Standards and Science and the National Research Foundation of Korea, Grants No. KRISS-GP2024-0015, No. 2022R1A2C2004735and No. RS-2024-00345856. This work was also supported by the National Supercomputing Center with supercomputing resources, including technical support (KSC-2023-CRE-0322). The work at Ajou University was supported by Global - Learning & Academic research institution for Master\\u2019s\\u00B7PhD students, and Postdocs (G-LAMP) Program of the NRF funded by the Ministry of Education (No. RS-2023-00285390). The Advanced Light Source (ALS) is supported by the Office of Basic Energy Science of the U.S. DOE under Contract No. DE-AC02-05CH11231.
