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Title: Giant switchable Rashba effect in oxide heterostructures

One of the most fundamental phenomena and a reminder of the electron’s relativistic nature is the Rashba spin splitting for broken inversion symmetry. Usually this splitting is a tiny relativistic correction. Interfacing ferroelectric BaTiO₃ and a 5d (or 4d) transition metal oxide with a large spin-orbit coupling, Ba(Os,Ir,Ru)O₃, we show that giant Rashba spin splittings are indeed possible and even controllable by an external electric field. Based on density functional theory and a microscopic tight binding understanding, we conclude that the electric field is amplified and stored as a ferroelectric Ti-O distortion which, through the network of oxygen octahedra, induces a large (Os,Ir,Ru)-O distortion. The BaTiO₃/Ba(Os,Ru,Ir)O₃ heterostructure is hence the ideal test station for switching and studying the Rashba effect and allows applications at room temperature.
 [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [1]
  1. Vienna Univ. of Technology, Vienna (Austria)
  2. Vienna Univ. of Technology, Vienna (Austria); Yancheng Inst. of Technology (China)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
  4. Computational Condensed Matter Physics Lab., Wako, Saitama (Japan); Advanced Inst. for Computational Science, Kobe, Hyogo (Japan); Center for Emergent Matter Science, Wako, Saitama (Japan)
Publication Date:
OSTI Identifier:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Advanced Materials Interfaces
Additional Journal Information:
Journal Volume: 2; Journal Issue: 5; Journal ID: ISSN 2196-7350
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
Country of Publication:
United States
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; oxide heterostructures; spin orbit coupling; rashba effect; ferroelectricity