Observation of Circular Dichroism Induced by Electronic Chirality

Publikation: Beitrag in FachzeitschriftForschungsartikelBeigetragenBegutachtung

Beitragende

  • Qian Xiao - , Peking University (Autor:in)
  • Oleg Janson - , Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden (Autor:in)
  • Sonia Francoual - , Deutsches Elektronen-Synchrotron (DESY) (Autor:in)
  • Qingzheng Qiu - , Peking University (Autor:in)
  • Qizhi Li - , Peking University (Autor:in)
  • Shilong Zhang - , Peking University (Autor:in)
  • Wu Xie - , Deutsches Elektronen-Synchrotron (DESY), Zhejiang University (Autor:in)
  • Pablo Bereciartua - , Deutsches Elektronen-Synchrotron (DESY) (Autor:in)
  • Jeroen Van Den Brink - , Exzellenzcluster ct.qmat: Komplexität und Topologie in Quantenmaterialien, Professur für Festkörpertheorie (gB/IFW), Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden, University of Amsterdam (Autor:in)
  • Jasper Van Wezel - , University of Amsterdam (Autor:in)
  • Yingying Peng - , Peking University, Collaborative Innovation Center of Quantum Matter (Autor:in)

Abstract

Chiral phases of matter, characterized by a definite handedness, abound in nature, ranging from the crystal structure of quartz to spiraling spin states in helical magnets. In 1T-TiSe2 a source of chirality has been proposed that stands apart from these classical examples as it arises from combined electronic charge and quantum orbital fluctuations. This may allow its chirality to be accessed and manipulated without imposing either structural or magnetic handedness. However, direct bulk evidence that broken inversion symmetry and chirality are intrinsic to TiSe2 remains elusive. Here, employing resonant elastic x-ray scattering technique, we reveal the presence of circular dichroism, i.e., polarization dependence of the resonant diffraction intensity, up to ∼40% at forbidden Bragg peaks that emerge at the charge and orbital ordering transition. The dichroism varies dramatically with incident energy and azimuthal angle. Comparison to calculated scattering intensities traces its origin to bulk chiral electronic order in TiSe2 and establishes resonant elastic x-ray scattering as a sensitive probe to electronic chirality.

Details

OriginalspracheEnglisch
Aufsatznummer126402
FachzeitschriftPhysical review letters
Jahrgang133
Ausgabenummer12
PublikationsstatusVeröffentlicht - 20 Sept. 2024
Peer-Review-StatusJa

Schlagworte

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