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

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 BaHfO 3 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.
Authors:
 [1] ;  [2] ;  [3]
  1. Seoul National Univ., Seoul (Korea, Republic of); Ames Lab. and Iowa State Univ., Ames, IA (United States)
  2. Seoul National Univ., Seoul (Korea, Republic of); Pohang Univ. of Science and Technology, Pohang (Korea)
  3. Seoul National Univ., Seoul (Korea, Republic of); Institute for Basic Science (IBS), Seoul (Korea)
Publication Date:
Report Number(s):
IS-J-9107
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:
AC02-07CH11358
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 94; Journal Issue: 11; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1337673
Alternate Identifier(s):
OSTI ID: 1326119