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d-wave holographic superconductors with backreaction in external magnetic fields

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Abstract

We study the d-wave holographic superconductors (the d-wave model proposed in [arXiv:1003.2991[hep-th]]) immersed in constant external magnetic fields by using the analytic matching method and numerical computation. In the probe limit, we calculate the spatially dependent condensate solution in the presence of the magnetism and find that the expression for the upper critical magnetic field satisfies the relation given in the Ginzburg- Landau theory. The result shows that the upper critical field gradually increases to its maximum value B c2 at absolute zero temperature T = 0, while vanishing at the critical temperature T = T c. Moving away from the probe limit, we investigate the effect of spacetime backreaction on the critical temperature and the upper critical magnetic field. The magnetic fields as well as the electric fields acting as gravitational sources reduce the critical temperature of the superconductor and actually result in a dyonic black hole solution to the leading order. We obtain the expression for the upper critical magnetic field up to O(κ2) order. The analytic result is consistent with the numerical findings.

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Authors and Affiliations

  1. Department of Physics, Shanghai University, 200444, Shanghai, China

    Xian-Hui Ge & Shao Fei Tu

  2. INPAC and Department of Physics, Shanghai Jiaotong University, 200240, Shanghai, China

    Bin Wang

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  1. Xian-Hui Ge
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  2. Shao Fei Tu
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  3. Bin Wang
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Correspondence to Xian-Hui Ge.

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ArXiv ePrint: 1209.4272

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Ge, XH., Tu, S.F. & Wang, B. d-wave holographic superconductors with backreaction in external magnetic fields. J. High Energ. Phys. 2012, 88 (2012). https://doi.org/10.1007/JHEP09(2012)088

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