Abstract
We study a holographic model which exhibits a quantum phase transition from the strongly interacting Weyl semimetal phase to an insulating phase. In the holographic insulating phase there is a hard gap in the real part of frequency dependent diagonal conductivities. However, the anomalous Hall conductivity is nonzero at zero frequency, indicting that it is a Chern insulator. This holographic quantum phase transition is always of first order, signified by a discontinuous anomalous Hall conductivity at the phase transition, in contrast to the very continuous holographic Weyl semimetal/trivial semimetal phase transition. Our work reveals the novel phase structure of strongly interacting Weyl semimetal.
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Liu, Y., Zhao, J. Weyl semimetal/insulator transition from holography. J. High Energ. Phys. 2018, 124 (2018). https://doi.org/10.1007/JHEP12(2018)124
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DOI: https://doi.org/10.1007/JHEP12(2018)124