Marginal and irrelevant disorder in Einstein-Maxwell backgrounds

We study analytically the effect of a weak random chemical potential of zero average in an Einstein-Maxwell background. For uncorrelated disorder this perturbation is relevant; however we show that it can become marginal or even irrelevant by tuning disorder correlations. At zero temperature we find...

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Bibliographic Details
Published in:Physical review. D 2016-03, Vol.93 (6), Article 065025
Main Authors: García-García, Antonio M., Loureiro, Bruno
Format: Article
Language:English
Subjects:
Chemical potential
Disorders
Electrical conductivity
Mathematical analysis
Perturbation methods
Strength
Thermal conductivity
Tuning
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Summary:We study analytically the effect of a weak random chemical potential of zero average in an Einstein-Maxwell background. For uncorrelated disorder this perturbation is relevant; however we show that it can become marginal or even irrelevant by tuning disorder correlations. At zero temperature we find that, to leading order in the disorder strength, the correction to the conductivity for irrelevant perturbations vanishes. In the marginal case, in order to renormalize a logarithmic divergence, we carry out a resummation of the perturbative expansion of the metric that leads to a Lifshitz-like geometry in the infrared. Disorder in this case also induces a positive correction to the conductivity. At finite temperature the black hole acquires an effective charge and the thermal conductivity has the expected Drude peak that signals the breaking of translational invariance. However the electric conductivity is not affected by the random chemical potential to leading order in the disorder strength.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.93.065025