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<p>Chiral phonons—circularly polarized lattice vibrations with angular momentum—have become a key frontier in quantum materials. They offer ways to control heat and information through their coupling to electronic spin and orbital and valley degrees of freedom. We present a symmetry-based framework that classifies phonon chirality across all crystallographic space groups. Our approach, built on the symmetry representations of phonon angular momentum in reciprocal space, identifies three phononic material classes, namely, crystals with no chirality, chiral crystals with conventional <i>s</i>-wave helicity, and a group of achiral crystals hosting exotic higher-order helicities such as <i>d</i>, <i>g</i> and <i>i</i> waves. Through high-throughput computation, we shortlist the most promising material candidates for experimental investigation. These results are compiled into the open-access Chiral Phonon Materials Database, which enables screening for materials with the desired chiral phonon properties. Our work establishes both theoretical framework and material platform required to exploit the properties of chiral phonons for next-generation thermal management and quantum technologies.</p>

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Symmetry-guided catalogue of chiral phonon materials

  • 期刊论文

  • 发表日期：

    2026年4月17日

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  • Yue Yang,
  • Zhenyu Xiao,
  • Yu Mao,
  • Zhanghuan Li,
  • Zhenyang Wang,
  • Tianqi Deng,
  • Yanhao Tang,
  • Zhi-Da Song,
  • Yuan Li,
  • Huiqiu Yuan,
  • Ming Shi,
  • Yuanfeng Xu

摘要

Chiral phonons—circularly polarized lattice vibrations with angular momentum—have become a key frontier in quantum materials. They offer ways to control heat and information through their coupling to electronic spin and orbital and valley degrees of freedom. We present a symmetry-based framework that classifies phonon chirality across all crystallographic space groups. Our approach, built on the symmetry representations of phonon angular momentum in reciprocal space, identifies three phononic material classes, namely, crystals with no chirality, chiral crystals with conventional s-wave helicity, and a group of achiral crystals hosting exotic higher-order helicities such as d, g and i waves. Through high-throughput computation, we shortlist the most promising material candidates for experimental investigation. These results are compiled into the open-access Chiral Phonon Materials Database, which enables screening for materials with the desired chiral phonon properties. Our work establishes both theoretical framework and material platform required to exploit the properties of chiral phonons for next-generation thermal management and quantum technologies.