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Universal fermionic spectral functions from string theory · Around

2011

Universal fermionic spectral functions from string theory

Gauntlett, Jerome P., Sonner, Julian, Waldram, Daniel

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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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