Ideas of topology have been widely applied to electronic band structures. We have been exploring the application these ideas to phonon and other excitations.

Figure 1: A cartoon of double Weyl phonons as we reported in Phys. Rev. Lett. 121, 035302 (2018).

Example papers

  1. Observation of a chiral wave function in the twofold-degenerate quadruple Weyl system BaPtGe Haoxiang Li, Tiantian Zhang, A. Said, Y. Fu, G. Fabbris, D. G. Mazzone, J. Zhang, J. Lapano, H. N. Lee, H. C. Lei, M. P. M. Dean, S. Murakami, and H. Miao Phys. Rev. B 103, 184301 (2021) [Abs] [PDF] [HTML] [Supp]
  2. Phononic Helical Nodal Lines with PT Protection in MoB2 T. T. Zhang, H. Miao, Q. Wang, J. Q. Lin, Y. Cao, G. Fabbris, A. H. Said, X. Liu, H. C. Lei, Z. Fang, H. M. Weng, and M. P. M. Dean Phys. Rev. Lett. 123, 245302 (2019) [Abs] [PDF] [HTML] [Supp]
  3. Observation of double Weyl phonons in parity-breaking FeSi Hu Miao, TT Zhang, Le Wang, Derek Meyers, AH Said, YL Wang, YG Shi, HM Weng, Zhong Fang, and MPM Dean Phys. Rev. Lett. 121, 035302 (2018) [Abs] [PDF] [HTML] [Supp] [ANL Highlight]