Wednesday, May 1, 2013

1304.7774 (Julian Sonner)

On universality of charge transport in AdS/CFT    [PDF]

Julian Sonner
We develop the holographic formulation of transport in strongly coupled two-layer systems. We identify a dc conductivity, sigma^dc, that is finite even in a translationally invariant setup, and universal for CFTs with a gravity dual. The thermoelectric conductivity and heat conductivity are fully determined by the electrical conductivity matrix, as a consequence of Ward identities. We use the memory-matrix approach for double-layer systems, together with Ward identities, to show that sigma^dc - extended to finite frequency - has no Drude peak and, similarly, that its universal value is unaffected if translation invariance is softly broken.
View original: http://arxiv.org/abs/1304.7774

No comments:

Post a Comment