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This content will become publicly available on September 22, 2017

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

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. 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:
OSTI Identifier:
1337673
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