Exactly soluble model for a fractionalized Weyl semimetal

  title={Exactly soluble model for a fractionalized Weyl semimetal},
  author={Fabian Hotz and Apoorv Tiwari and Oguz Turker and Tobias Meng and Ady Stern and Maciej Koch-Janusz and Titus Neupert},
  journal={Physical Review Research},
We construct an exactly solvable lattice model of a fractional Weyl semimetal. The low-energy theory of this strongly interacting state is that of a Weyl semimetal built out of fractionally charged fermions. We show the existence of a universally quantized and fractional circular photogalvanic effect and a violation of the Wiedemann-Franz law in the system. Together with a spectral gap in the single-particle electronic Green's function, they provide strong experimental signatures for this… 

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