Long Island University
Holographic Sliding Stripes and Pinning
Holographic models provide unique laboratories to investigate nonlinear physics of transport in inhomogeneous systems. We analyze both the DC and AC conductivities in a defect conformal field theory with spontaneous stripe order. The spatial symmetry is broken at large chemical potential, and the resulting ground state is a combination of a spin and charge density wave. An infinitesimal applied electric field across the stripes will cause the stripes to slide over the underlying density of smeared impurities, a phenomenon which can be associated with the Goldstone mode for the spontaneously broken translation symmetry. We introduce explicit sources of symmetry breaking and demonstrate pinning for the first time in a holographic model, in which the translational Goldstone mode is lifted by the introduction of explicit sources of translational symmetry breaking.