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

TitleStrongly enhanced Rashba splittings in an oxide heterostructure: A tantalate monolayer on BaHfO3
Publication TypeJournal Article
Year of Publication2016
AuthorsKim, M, Ihm, J, Chung, SB
JournalPhysical Review B
Volume94
Pagination115431
Date Published09
Type of ArticleArticle
ISBN Number2469-9950
Accession NumberWOS:000383863400005
Keywords2-dimensional electron-gas, interfaces, liquid, physics, srtio3, superconductivity, surface, wannier functions
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 t(2g) 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 t(2g)-e(g) 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.

DOI10.1103/PhysRevB.94.115431
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Exploratory Theory

Alternate JournalPhys. Rev. B