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Related Experiment Video

Updated: Dec 23, 2025

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Radial Spin Texture in Elemental Tellurium with Chiral Crystal Structure.

M Sakano1,2, M Hirayama3,4,5, T Takahashi6

  • 1Institute for Solid State Physics (ISSP), The University of Tokyo, Kashiwa 277-8581, Japan.

Physical Review Letters
|April 18, 2020
PubMed
Summary

Chiral crystals exhibit unique spin textures. Researchers used spin-resolved photoemission spectroscopy to observe hedgehog-like spin textures in elemental tellurium, confirming their dependence on crystal chirality.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Mechanics

Background:

  • Chiral crystals lack mirror symmetry, leading to distinct right- and left-handed structures.
  • Noncentrosymmetric crystals are predicted to lock electron spin and momentum due to spin-orbit interaction.
  • Understanding spin textures in chiral materials is crucial for novel electronic applications.

Purpose of the Study:

  • To investigate the spin and electronic structure of elemental tellurium, a simple chiral crystal.
  • To experimentally reveal the spin textures in the highest valence band of p-type tellurium.
  • To confirm the relationship between crystal chirality and spin polarization.

Main Methods:

  • Utilizing spin- and angle-resolved photoemission spectroscopy (SARPES).
  • Analyzing the electronic band structure and spin polarization of elemental tellurium.
  • Comparing spin textures in tellurium crystals with opposite chiralities.

Main Results:

  • Observed a spin component parallel to electron momentum in the highest valence band at the Brillouin zone corners.
  • Demonstrated that spin polarization reverses in crystals with opposite chirality.
  • Confirmed hedgehog-like spin textures in both right- and left-handed chiral tellurium.

Conclusions:

  • Elemental tellurium exhibits distinct, chirality-dependent spin textures.
  • These findings support the existence of unconventional magnetoelectric effects and nonreciprocal phenomena in chiral crystals.
  • The study provides experimental evidence for spin-momentum locking in the simplest chiral semiconductor.