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Chirality in the Kagome Metal CsV_{3}Sb_{5}.

H J Elmers1, O Tkach1,2, Y Lytvynenko1,3

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|March 25, 2025
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Researchers discovered a chiral atomic and electronic structure in the CsV_{3}Sb_{5} kagome metal during its charge density wave (CDW) transition. This suggests an antiferromagnetic coupling of orbital magnetic moments, offering new insights into unconventional electronic states.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Materials

Background:

  • The kagome metal CsV_{3}Sb_{5} exhibits an unconventional charge density wave (CDW) state.
  • Understanding the interplay between structural and electronic properties in this CDW state is crucial.
  • Previous studies have explored its magnetic and electronic characteristics.

Purpose of the Study:

  • To investigate the geometric and electronic structure changes in CsV_{3}Sb_{5} during the CDW transition.
  • To probe the nature of chirality in the CDW phase using advanced spectroscopic techniques.
  • To correlate experimental findings with proposed theoretical models like orbital loop current order.

Main Methods:

  • X-ray photoelectron diffraction (XPD) to analyze atomic structure.
  • Angle-resolved photoemission spectroscopy (ARPES) with circularly polarized x-rays to study electronic structure.
  • Analysis of photoemission intensity changes and circular dichroism.

Main Results:

  • XPD patterns confirmed a chiral atomic structure in the CDW phase of CsV_{3}Sb_{5}.
  • Pronounced circular dichroism in ARPES indicated a chiral electronic structure.
  • The observed chirality is consistent with orbital loop current order and suggests antiferromagnetic coupling of orbital magnetic moments.

Conclusions:

  • The study provides direct evidence for a chiral electronic state in the CDW phase of CsV_{3}Sb_{5}.
  • The findings support theoretical models involving orbital loop currents.
  • The results suggest antiferromagnetic coupling of orbital magnetic moments, despite weak structural distortions.