  We study collective excitations of cold (2+1)-dimensional fundamental matter
living on a defect of the four-dimensional N=4 super Yang-Mills theory in the
Higgs branch. This system is realized holographically as a D3-D5 brane
intersection, in which the D5-brane is treated as a probe with a non-zero gauge
flux across the internal part of its worldvolume. We study the holographic zero
sound mode in the collisionless regime at low temperature and find a simple
analytic result for its dispersion relation. We also find the diffusion
constant of the system in the hydrodynamic regime at higher temperature. In
both cases we study the dependence on the flux parameter which determines the
amount of Higgs symmetry breaking. We also discuss the anyonization of this
construction.
