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Chemical control of the Rashba spin splitting size of α -GeTe(111) surface states by adjusting the potential at the topmost atomic layer

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Title
Chemical control of the Rashba spin splitting size of α -GeTe(111) surface states by adjusting the potential at the topmost atomic layer
Author(s)
Hanyoung Ryu; Lihm, Jae-Mo; Joonil Cha; Kim, Beomyoung; Beom Seo Kim; Wonshik Kyung; Inkyung Song; Kim, Yeongkwan; Garam Han; Denlinger, Jonathan; In Chung; Cheol-Hwan Park; Park, Seung Ryong; Changyoung Kim
Publication Date
2021-06
Journal
PHYSICAL REVIEW B, v.103, no.24
Publisher
American Physical Society
Abstract
© 2021 American Physical Society.As control of the Rashba spin splitting size is highly desirable for spintronic devices, intensive studies have been performed to vary the splitting size by, for example, applying an electric field or designing novel heterostructures. However, direct observation of Rashba spin splitting size change via spectroscopic measurements has not been done so far. Here, we report results of angle-resolved photoemission studies on ferroelectric α-GeTe(111). We observe that the Rashba splitting size of α-GeTe(111) surface states is reduced upon dosing with potassium (K) which has a very low electron affinity. Based on density functional theory calculations, we find that the electric potential energy at the topmost atomic layer and the surface potential energy barrier is reduced upon K dosing. This change in the surface potential induces both delocalization of the surface states and reduction of the splitting size. We expect to increase the splitting size by dosing other elements or molecules with high electron affinity.
URI
https://pr.ibs.re.kr/handle/8788114/10080
DOI
10.1103/PhysRevB.103.245113
ISSN
2469-9950
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
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