On Holographic Insulators and Supersolids

Understand

We obtain holographic realizations for systems that have strong similarities to Mott insulators and supersolids, after examining the ground states of Einstein-Maxwell-scalar systems.

• The real part of the AC conductivity has a hard gap and a discrete spectrum only.
• We add momentum dissipation to resolve the delta function in the conductivity due to translational invariance.
• We develop tools to directly calculate the Drude weight for a large class of solutions and to support our claims.