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On the AdS/BCFT approach to quantum Hall systems

Journal of High Energy Physics volume 2013, Article number: 116 (2013) Cite this article

Abstract

In this paper we study a simple gravity model dual to a 2 + 1-dimensional system with a boundary at finite charge density and temperature. In our naive AdS/BCF T extension of a well known AdS/CFT system a non-zero charge density must be supported by a magnetic field. As a result, the Hall conductivity is a constant inversely proportional to the coefficients of pertinent topological terms. Since the direct conductivity vanishes, such behaviors resemble that of a quantum Hall system with Fermi energy in the gap between the Landau levels. We further analyze the properties stemming from our holographic approach to a quantum Hall system. We find that at low temperatures the thermal and electric conductivities are related through the Wiedemann-Franz law, so that every charge conductance mode carries precisely one quantum of the heat conductance. From the computation of the edge currents we learn that the naive holographic model is dual to a gapless system if tensionless RS branes are used in the AdS/BCFT construction. To reconcile this result with the expected quantum Hall behavior we conclude that gravity solutions with tensionless RS branes must be unstable, calling for a search of more general solutions. We briefly discuss the expected features of more realistic holographic setups.

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Authors and Affiliations

  1. International Institute of Physics, Federal University of Rio Grande do Norte, Av. Odilon Gomes de Lima 1722, Capim Macio, Natal-RN, 59078-400, Brazil

    Dmitry Melnikov, Emanuele Orazi & Pasquale Sodano

  2. Institute for Theoretical and Experimental Physics, B. Cheremushkinskaya 25, Moscow, 117218, Russia

    Dmitry Melnikov

  3. INFN — Laboratori Nazionali di Frascati, Via Enrico Fermi 40, I-00044, Frascati, Italy

    Emanuele Orazi

  4. INFN — Sezione di Perugia, Via A. Pascoli, I-06123, Perugia, Italy

    Pasquale Sodano

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  1. Dmitry Melnikov
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Correspondence to Dmitry Melnikov.

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ArXiv ePrint: 1211.1416

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Melnikov, D., Orazi, E. & Sodano, P. On the AdS/BCFT approach to quantum Hall systems. J. High Energ. Phys. 2013, 116 (2013). https://doi.org/10.1007/JHEP05(2013)116

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  • DOI: https://doi.org/10.1007/JHEP05(2013)116

Keywords

  • AdS-CFT Correspondence
  • Holography and condensed matter physics (AdS/CMT)