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arXiv · 0811.0480

Transport Properties of Holographic Defects

Robert C. Myers·Matthias C. Wapler
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Abstract

We study the charge transport properties of fields confined to a (2+1)-dimensional defect coupled to (3+1)-dimensional super-Yang-Mills at large-$\nc$ and strong coupling, using AdS/CFT techniques applied to linear response theory. The dual system is described by $\nf$ probe D5- or D7-branes in the gravitational background of $\nc$ black D3-branes. Surprisingly, the transport properties of both defect CFT's are essentially identical -- even though the D7-brane construction breaks all supersymmetries. We find that the system possesses a conduction threshold given by the wave-number of the perturbation and that the charge transport arises from a quasiparticle spectrum which is consistent with an intuitive picture where the defect acquires a finite width. We also examine finite-$λ$ modifications arising from higher derivative interactions in the probe brane action.

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Robert C. Myers, Matthias C. Wapler. 2009-01-02. Transport Properties of Holographic Defects. https://doi.org/10.1088/1126-6708%2F2008%2F12%2F115

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