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arXiv 2005.13329hep-th
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具有共形anomaly修正的全息$s$波超导体

Holographic $s$-wave superconductors with conformal anomaly correction

Jun-Wang Lu, Huai-Fan Li, Ya-Bo Wu

摘要:

在四维共形异常修正的~(CAC)AdS引力场中,建立了全息$s$波导体/超导体模型和绝缘体/超导体模型。CAC参数$α$的影响进行了研究,使用数值和分析方法在探头近似。具体地说,当CAC参数增大时,导体/超导体相变的临界温度增大,而绝缘体/超导体相变的临界化学势减小,这表明增大CAC参数增强了两种超导相变.同时,在低于临界温度或超过临界化学势时,标量头发开始凝聚,凝聚相是热力学稳定的。数值计算得到的临界行为通过我们的解析分析得到了证实。对于我们所考虑的参数,导体/超导体模型中的能隙随CAC参数的增加而单调减小,而对于绝缘体/超导体模型,准粒子激发的能量随CAC参数的增加而减小。

英文摘要:

We build a holographic $s$-wave conductor/superconductor model and an insulator/superconductor model in the four-dimensional conformal anomaly corrected~(CAC) AdS gravity. The effects of CAC parameter $α$ are studied using both numerical and analytical methods in the probe approximation. Concretely, when the CAC parameter increases, the critical temperature increases for the conductor/superconductor phase transition, while the critical chemical potential decreases for the insulator/superconductor case, which suggests that the increasing CAC parameter enhances both superconducting phase transitions. Meanwhile, below the critical temperature or beyond the critical chemical potential, the scalar hair begins to condense, and the condensed phases are found to be thermodynamically stable. The critical behaviors obtained from numerics are confirmed by our analytical analysis. For the parameters we are considering, the energy gap in the conductor/superconductor model decreases monotonically by increasing the CAC parameter, while for the insulator/superconductor model the energy of quasiparticle excitations decreases with the CAC parameter.

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