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The equation of an ellipse centered at the origin defines all points whose distances from the center maintain a constant ratio between the horizontal and vertical axes. This equation results in a smooth, closed curve that extends further along the x-axis than the y-axis, giving it a horizontal orientation. Such an ellipse demonstrates three kinds of symmetry: across the x-axis, across the y-axis, and about the origin. These symmetries are essential in understanding the graph's structure and...
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The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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Persistent spin texture enforced by symmetry.

L L Tao1, Evgeny Y Tsymbal2

  • 1Department of Physics and Astronomy, Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, NE, 68588, USA.

Nature Communications
|July 19, 2018
PubMed
Summary
This summary is machine-generated.

Persistent spin texture (PST) in noncentrosymmetric materials, enforced by crystal symmetry, promises long spin lifetimes for spintronics. This discovery expands the material choices for advanced electronic applications.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid-State Physics

Background:

  • Persistent spin texture (PST) enables long carrier spin lifetimes, crucial for spintronics.
  • PST is a property where spin configuration remains uniform in momentum space.

Purpose of the Study:

  • To predict and identify noncentrosymmetric bulk materials exhibiting PST enforced by nonsymmorphic crystal symmetry.
  • To explore the potential of these materials for spintronics applications.

Main Methods:

  • Utilizing density-functional theory (DFT) calculations.
  • Investigating materials with nonsymmorphic space group symmetry.
  • Analyzing spin-orbit interactions around high symmetry points in the Brillouin zone.

Main Results:

  • Identified a class of noncentrosymmetric materials where nonsymmorphic symmetry enforces PST.
  • Demonstrated that sublattice degrees of freedom constrain the spin-orbit field, maintaining PST independent of momentum.
  • Highlighted BiInO3, a ferroelectric oxide, as a promising wide band gap semiconductor exhibiting PST.

Conclusions:

  • Nonsymmorphic crystal symmetry offers a novel mechanism for realizing PST.
  • The identified materials, including BiInO3, expand the palette for spintronics device development.
  • This work provides a pathway for designing materials with enhanced spin properties.