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Holographic strange metals are known to have a power law resistivity risingwith temperature, which is reminiscent of the strange metal phases in condensedmatter systems. In some holographic models, however, the exponent of the powerlaw in the resistivity can be negative. In this case one encounters phases withdiverging resistivity at zero temperature: holographic strange insulators.  These states arise as a result of translational symmetry breaking in thesystem, which can either be strong explicit and relevant in the IR, orspontaneous, but pinned by a small explicit source. In some regards, one canassociate these two classes to the normal band insulators due to the strongionic potential, and Mott insulator due to the commensurate lock in of thecharge density wave.  We study different features of these classes on the explicit example of aholographic helical model with homogeneous Bianchy VII type translationalsymmetry breaking, and uncover the main mechanisms underlying transport inthese two cases. We find that while transport in the explicit relevant case isgoverned by the incoherent conductivity, in the pinned spontaneous case theleading contribution comes from the coherent part.

Coherent vs incoherent transport in holographic strange insulators