Speaker
Niko Jokela
Description
In a holographic probe-brane model exhibiting a
spontaneously spatially modulated CDW+SDW ground state,
I will introduce explicit sources of symmetry breaking in the
form of ionic and antiferromagnetic lattices. I will
demonstrate pinning, in which the translational Goldstone
mode is lifted by the introduction of explicit sources of
translational symmetry breaking. The numerically computed
optical conductivity fits very well to a Drude-Lorentz model
with a small residual metallicity, precisely matching analytic
formulas for the DC conductivity. I also demonstrate an
instability of the striped phase in the presence of a large-
amplitude ionic lattice.