Weyl and Dirac excitations

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).



  1. Giant phonon anomalies in the proximate Kitaev quantum spin liquid α-RuCl3
    Haoxiang Li, T. T. Zhang, A. Said, G. Fabbris, D. G. Mazzone, J. Q. Yan, D. Mandrus, Gábor B. Halász, S. Okamoto, S. Murakami, M. P. M. Dean, H. N. Lee, and H. Miao
    Nature Communications 12, 3513 (2021)
  2. 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)


  1. 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)


  1. 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)
    [ANL Highlight]