Universal fermionic spectral functions from string theory

Details Universal fermionic spectral functions from string theory Universal fermionic spectral functions from string theory

2011-06-23

arxiv.org/abs/1106.4694v2

Physics

High Energy Physics

High Energy Physics - Theory

5 pages. Content the same, but significant change of presentation. Version to be published in Phys. Rev. Lett

Scientific paper

We carry out the first holographic calculation of a fermionic response function for a strongly coupled $d=3$ system with an explicit D=10 or D=11 supergravity dual. By considering the supersymmetry current, we obtain a universal result applicable to all d=3 N=2 SCFTs with such duals. Surprisingly, the spectral function does not exhibit a Fermi surface, despite the fact that the system is at finite charge density. We show that it has a phonino pole and at low frequencies there is a depletion of spectral weight with a power-law scaling which is governed by a locally quantum critical point.

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