Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-08-24
JHEP 1101:149,2011
Physics
Condensed Matter
Strongly Correlated Electrons
16 pages; v2: minor typos fixed and ref added; v3: typo fixed and discussion of S-duality clarified and expanded
Scientific paper
10.1007/JHEP01(2011)149
Transport at a quantum critical point depends sensitively on the relative magnitudes of temperature, frequency and electric field. Here we used the gauge/gravity correspondence to compute the full temperature and, generally nonlinear, electric field dependence of the electrical conductivity for some model critical theories. In the special case of 2+1 dimensions we are also able to find the full time-dependent response of the system to an arbitrary time dependent external electric field. The response of the system is instantaneous, implying a frequency independent conductivity. We describe a mechanism that rationalizes the instantaneous response.
Karch Andreas
Sondhi Shivaji L.
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