Strongly enhanced Rashba splittings in an oxide heterostructure: A tantalate monolayer on BaHfO3

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Title
Strongly enhanced Rashba splittings in an oxide heterostructure: A tantalate monolayer on BaHfO3
Author(s)
Minsung Kim; Jisoon Ihm; Suk Bum Chung
Publication Date
2016-09
Journal
PHYSICAL REVIEW B, v.94, no.11, pp.115431 -
Publisher
AMER PHYSICAL SOC
Abstract
In the two-dimensional electron gas emerging at the transition metal oxide surface and interface, various exotic electronic ordering and topological phases can become experimentally more accessible with the stronger Rashba spin-orbit interaction. Here, we present a promising route to realize significant Rashba-type band splitting using a thin film heterostructure. Based on first-principles methods and analytic model analyses, a tantalate monolayer on BaHfO3 is shown to host two-dimensional bands originating from Ta t2g states with strong Rashba spin splittings, nearly 10% of the bandwidth, at both the band minima and saddle points. An important factor in this enhanced splitting is the significant t2g-eg interband coupling, which can generically arise when the inversion symmetry is maximally broken due to the strong confinement of the 2DEG on a transition metal oxide surface. Our results could be useful in realizing topological superconductivity at oxide surfaces. © 2016 American Physical Society
URI
https://pr.ibs.re.kr/handle/8788114/2866
ISSN
2469-9950
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
Files in This Item:
Physical Review B_94_115431_2016.pdfDownload

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