Holographic spectral functions in metallic AdS/CFT (original) (raw)

Holographic spectral functions and diffusion constants for fundamental matter

2007

The holographic dual of large-Nc super-Yang-Mills coupled to a small number of flavours of fundamental matter, Nf << Nc, is described by Nf probe D7-branes in the gravitational background of Nc black D3-branes. This system undergoes a first order phase transition characterised by the `melting' of the mesons. We study the high temperature phase in which the D7-branes extend through the black hole horizon. In this phase, we compute the spectral function for vector, scalar and pseudoscalar modes on the D7-brane probe. We also compute the diffusion constant for the flavour currents.

Non-linear DC Conductivity From Probe Branes 2 3 Probe Branes In Schrödinger Spacetime From NMT

2018

We study the non-equilibrium steady-state phase transition from probe brane holography in z = 2 Schrödinger spacetime. Concerning differential conductivity, a phase transition could occur in the conductor state. Considering constant current operator as the external field and the conductivity as an order parameter, we derive scaling behavior of order parameter near the critical point. We explore the critical exponents of the non-equilibrium phase transition in two different Schrödinger spacetimes, which originated 1) from supergravity, and 2) from AdS blackhole in the light-cone coordinates. Interestingly, we will see that even at the zero charge density, in our first geometry, the dynamical critical exponent of z = 2 has a major effect on the critical exponents.