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Large spin splittings due to the orbital degree of freedom and spin textures in a ferroelectric nitride perovskite

Journal Article · · Physical Review B
 [1];  [2];  [3];  [4];  [5];  [6];  [4];  [6];  [2]
  1. Univ. of Arkansas, Fayetteville, AR (United States); OSTI
  2. Univ. of Arkansas, Fayetteville, AR (United States)
  3. CentraleSupélec, Gif-sur-Yvette (France); National Centre for Scientific Research-Mixed Organizations (CNRS-UMR), Paris (France); Univ. Paris-Saclay, Gif-sur-Yvette (France)
  4. Univ. of Toulouse (France); Centre National de la Recherche Scientifique (CNRS), Toulouse (France)
  5. Kyoto Univ. (Japan)
  6. Nanjing Univ. (China)
First-principles simulations are conducted to predict that ferroelectric nitride perovskite LaWN3 not only exhibits large spin splittings (2.7 eV Å) but also possesses unique spin textures for some of its conduction levels. Such spin splittings around the Γ and L points cannot be interpreted as a typical mixture of Rashba or Dresselhaus configurations but rather require the development of four-band $$\textit{k ∙ p}$$ models with high-order terms. We further identify that, for some bands, spin splittings can be greatly contributed by the pure orbital degree of freedom (PODF), a unique character of our four-band Hamiltonian compared to the traditional two-band version. The concept of PODF-enhanced spin splittings paves a way for designing materials with large spin splittings. Moreover, the energy levels possessing such large splittings and complex spin textures can be brought close to the conduction-band minimum by applying epitaxial strain.
Research Organization:
Univ. of Arkansas, Fayetteville, AR (United States)
Sponsoring Organization:
National Natural Science Foundation of China (NSFC); US Army Research Office (ARO); US Department of the Navy, Office of Naval Research (ONR); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0002220
OSTI ID:
1801560
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 4 Vol. 102; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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