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Topological phonons in ferroelectrics switched by light

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Topological states of electrons and photons have been well studied. I will talk about topological phonons and where to find them. Even in well-known materials, such phonon topology can be found everywhere and are protected by certain crystalline symmetry. In ferroelectrics, structural phase transition breaks the inversion symmetry in one direction while preserves mirror symmetry in another, leading to the emergence of Weyl phonons with coexisting nodal line phonons. Such topological phase can be switched on/off by light even without structural phase transition.

This talk is part of the Electronic Structure Discussion Group series.

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