4.8 Article

Chiral structures of electric polarization vectors quantified by X-ray resonant scattering

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NATURE COMMUNICATIONS
卷 13, 期 1, 页码 -

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NATURE PORTFOLIO
DOI: 10.1038/s41467-022-29359-5

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资金

  1. National Research Foundation of Korea [NRF-2020R1A2C1009597, NRF-2019K1A3A7A09033387, NRF-2021R1C1C1009494]
  2. Quantum Materials program from the Office of Basic Energy Sciences, US Department of Energy [DE-AC02-05CH11231]
  3. U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC-0012375]
  4. Army Research Office [W911NF-21-2-0162]
  5. Luxembourg National Research Fund [FNR/C18/MS/12705883/REFOX]
  6. Czech Science Foundation [19-28594X]
  7. Diamond Light Source, UK
  8. U.S. Department of Energy (DOE) [DE-AC02-05CH11231]
  9. DOE's Office of Science [DE-AC02-06CH11357]
  10. National Research Foundation of Korea [2019K1A3A7A09033387] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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REXS is a unique tool for investigating solid-state systems, providing spatial knowledge and electronic information simultaneously, allowing the probing of magnetic, charge, spin, orbital degrees of spatial order, and electronic structure. The study of polar chiral structures using REXS has emerged as a promising new application, with significant progress made in analyzing experimental results related to polar vortex arrays in PbTiO3/SrTiO3 superlattices.
Resonant elastic X-ray scattering (REXS) offers a unique tool to investigate solid-state systems providing spatial knowledge from diffraction combined with electronic information through the enhanced absorption process, allowing the probing of magnetic, charge, spin, and orbital degrees of spatial order together with electronic structure. A new promising application of REXS is to elucidate the chiral structure of electrical polarization emergent in a ferroelectric oxide superlattice in which the polarization vectors in the REXS amplitude are implicitly described through an anisotropic tensor corresponding to the quadrupole moment. Here, we present a detailed theoretical framework and analysis to quantitatively analyze the experimental results of Ti L-edge REXS of a polar vortex array formed in a PbTiO3/SrTiO3 superlattice. Based on this theoretical framework, REXS for polar chiral structures can become a useful tool similar to x-ray resonant magnetic scattering (XRMS), enabling a comprehensive study of both electric and magnetic REXS on the chiral structures. The polar chiral texture of the vortex or skyrmion structure in ferroelectric oxide PbTiO3/SrTiO3 superlattice attracts attention. Here, the authors report a theoretical framework to probe emergent chirality of electrical polarization textures.

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