2008/11/30 by Robert C. Myers, Matthias C. Wapler · 1 citation
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Particle physics theoretical and experimental studies #cond-mat.str-el #hep-th
paper · pdf · doi:10.1088/1126-6708/2008/12/115
published as JHEP 0812:115,2008 · 54 pages, 22 figures, references added, minor changes to figures and comments, final version published in JHEP
openalex publication_date 2008/12/31 · arxiv created 2009/01/02 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
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.