| Title | Chern numbers of topological phonon band crossing determined with inelastic neutron scattering |
| Authors | 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 |
| Affiliation | Peking Univ, Int Ctr Quantum Mat, Sch Phys, Beijing 100871, Peoples R China Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China Brookhaven Natl Lab, Condensed Matter Phys & Mat Sci Div, Upton, NY 11973 USA Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China Comprehens Res Org Sci & Soc CROSS, Neutron Sci & Technol Ctr, Tokai, Ibaraki 3191106, Japan Oak Ridge Natl Lab, Neutron Scattering Div, Oak Ridge, TN 37831 USA Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 10083, Peoples R China Collaborat Innovat Ctr Quantum Matter, Beijing 100871, Peoples R China |
| Keywords | TOTAL-ENERGY CALCULATIONS WEYL POINTS SURFACE |
| Issue Date | 5-Dec-2022 |
| Publisher | PHYSICAL REVIEW B |
| Abstract | 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. |
| URI | http://hdl.handle.net/20.500.11897/667624 |
| ISSN | 2469-9950 |
| DOI | 10.1103/PhysRevB.106.224304 |
| Indexed | SCI(E) |
| Appears in Collections: | 量子材料科学中心 |
