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<p>A rapidly increasing body of work reporting phenomena associated with lattice vibrations carrying angular momentum has led to the emergence of the field of chiral phonons. Some of these properties, such as the phonon magnetic moment, also occur in achiral phonons that are circularly or elliptically polarized, while the presence of chirality has additional implications for the types of interaction allowed between the phonons and light, electrons and other quasiparticles. In this Perspective we introduce a framework for classifying phonons with angular momentum, and provide illustrations of the different types using examples from the recent literature. Specifically, we suggest the term ‘axial phonon’ to encompass all phonons that carry angular momentum, real or pseudo, and reserve the term ‘chiral phonon’ for those phonons that break improper rotational symmetry. We hope that this scheme provides clarification on the matter of phonon chirality and will serve as a guide for future research.</p>

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Chiral phonons

  • 期刊论文

  • 发表日期：

    2025年9月22日

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  • Dominik M. Juraschek,
  • R. Matthias Geilhufe,
  • Hanyu Zhu,
  • Martina Basini,
  • Peter Baum,
  • Andrey Baydin,
  • Swati Chaudhary,
  • Michael Fechner,
  • Benedetta Flebus,
  • Gael Grissonnanche,
  • Andrei I. Kirilyuk,
  • Mikhail Lemeshko,
  • Sebastian F. Maehrlein,
  • Maxime Mignolet,
  • Shuichi Murakami,
  • Qian Niu,
  • Ulrich Nowak,
  • Carl P. Romao,
  • Habib Rostami,
  • Takuya Satoh,
  • Nicola A. Spaldin,
  • Hiroki Ueda,
  • Lifa Zhang

摘要

A rapidly increasing body of work reporting phenomena associated with lattice vibrations carrying angular momentum has led to the emergence of the field of chiral phonons. Some of these properties, such as the phonon magnetic moment, also occur in achiral phonons that are circularly or elliptically polarized, while the presence of chirality has additional implications for the types of interaction allowed between the phonons and light, electrons and other quasiparticles. In this Perspective we introduce a framework for classifying phonons with angular momentum, and provide illustrations of the different types using examples from the recent literature. Specifically, we suggest the term ‘axial phonon’ to encompass all phonons that carry angular momentum, real or pseudo, and reserve the term ‘chiral phonon’ for those phonons that break improper rotational symmetry. We hope that this scheme provides clarification on the matter of phonon chirality and will serve as a guide for future research.