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  • Title: Ideal Type-II Weyl Phase and Topological Transition in Phononic Crystals.
    Author: Huang X, Deng W, Li F, Lu J, Liu Z.
    Journal: Phys Rev Lett; 2020 May 22; 124(20):206802. PubMed ID: 32501085.
    Abstract:
    Ideal Weyl points, which are related by symmetry and thus reside at the same frequency, could offer further insight into the Weyl physics. The ideal type-I Weyl points have been observed in photonic crystals, but the ideal type-II Weyl points with tilted conelike band dispersions are still not realized. Here we present the observation of the ideal type-II Weyl points of the minimal number in three-dimensional phononic crystals and, in the meantime, the topological phase transition from the Weyl semimetal to the valley insulators of two distinct types. The Fermi-arc surface states are shown to exist on the surfaces of the Weyl phase, and the Fermi-circle surface states are also observed, but on the interface of the two distinct valley phases. Intriguing wave partition of the Fermi-circle surface states is demonstrated.
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