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

Kim, Minsung; Ihm, Jisoon; Chung, Suk Bum

doi:10.1103/PhysRevB.94.115431

Title: Strongly enhanced Rashba splittings in an oxide heterostructure: A tantalate monolayer on ${BaHfO}_{3}$

Journal Article · Thu Sep 22 00:00:00 EDT 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.94.115431· OSTI ID:1337673

Kim, Minsung ^[1]; Ihm, Jisoon ^[2]; Chung, Suk Bum ^[3]

Seoul National Univ., Seoul (Korea, Republic of); Ames Lab. and Iowa State Univ., Ames, IA (United States)
Seoul National Univ., Seoul (Korea, Republic of); Pohang Univ. of Science and Technology, Pohang (Korea)
Seoul National Univ., Seoul (Korea, Republic of); Institute for Basic Science (IBS), Seoul (Korea)

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. Here, our results could be useful in realizing topological superconductivity at oxide surfaces.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1337673

Alternate ID(s):: OSTI ID: 1326119

Report Number(s):: IS-J-9107; PRBMDO

Journal Information:: Physical Review B, Vol. 94, Issue 11; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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Title: Strongly enhanced Rashba splittings in an oxide heterostructure: A tantalate monolayer on ${BaHfO}_{3}$