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Holography and condensed matter
This is a short review of recent developments in the application of AdS/CFT
methods to some condensed matter problems. In particular we present the
holographic description of a local quantum critical state, related to
(non)-Fermi liquids and the strange metal, that appears in large N CFTs with a
gravity dual at finite density and zero temperature, and explore its properties
by probing it with fermionic operators. Further we discuss possible bosonic and
fermionic instabilities, leading to s-, p- or d-wave holographic
superconductors and "electron stars". Finally we present a realization of local
quantum criticality via an impurity problem.Comment: 11 pages, 4 figures; Contribution to the proceedings of the "XVII
European Workshop on String Theory 2011", Padova, Italy, 5-9 September 2011;
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