Details

Autor(en) / Beteiligte

• Jin, Zhendong
• Hu, Biaoyan
• Liu, Yiran
• Li, Yangmu
• Zhang, Tiantian
• Iida, Kazuki
• Kamazawa, Kazuya
• Kolesnikov, A. I.
• Stone, M. B.
• Zhang, Xiangyu
• Chen, Haiyang
• Wang, Yandong
• Zaliznyak, I. A.
• Tranquada, J. M.
• Fang, Chen
• Li, Yuan

Titel

Chern numbers of topological phonon band crossing determined with inelastic neutron scattering

Ist Teil von

• Physical review. B, 2022-12, Vol.106 (22), Article 224304

Ort / Verlag

United States: American Physical Society (APS)

Erscheinungsjahr

2022

Link zum Volltext

Quelle

American Physical Society Journals

Beschreibungen/Notizen

• Topological invariants in the band structure, such as Chern numbers, are important for the understanding and classification of the topological properties of matter and dictate the occurrence of exotic behaviors, yet their direct spectroscopic determination has been largely limited to electronic bands. Here, we use inelastic neutron scattering in conjunction with ab initio calculations to identify a variety of topological phonon band crossings in MnSi and CoSi single crystals. We find a distinct relation between the Chern numbers of a band-crossing node and the scattering intensity modulation in momentum space around the node. Given sufficiently high resolution, our method can be used to determine arbitrarily large Chern numbers of topological phonon band-crossing nodes.