Zeroth order phase transition in a holographic superconductor with single impurity
Zeroth order phase transition in a holographic superconductor with single impurity
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DOI：
10.1016/j.nuclphysb.2015.05.025
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发表时间：
2014-11
期刊：
影响因子：
--
通讯作者：
H. Zeng;Hai-Qing Zhang
中科院分区：
文献类型：
--
作者：
H. Zeng;Hai-Qing Zhang
本文用全息方法研究了超导体中的单个正常杂质效应。当杂质的尺寸比主体超导体小得多时，我们可以重现安德森定理，该定理指出，传统的s波超导体对具有小杂质强度的正常（非磁性）杂质具有鲁棒性。然而，随着杂质尺寸的增加，超导体的临界温度Tc降低，这与凝聚态文献中的结果一致.更重要的是，在临界杂质浓度（或临界温度）的相变是零级的。
We investigate the single normal impurity effect in a superconductor by the holographic method. When the size of impurity is much smaller than the host superconductor, we can reproduce the Anderson theorem, which states that a conventional s-wave superconductor is robust to a normal (non-magnetic) impurity with small impurity strength. However, by increasing the size of the impurity in a fixed-size host superconductor, we find a decreasing critical temperature T c of the host superconductor, which agrees with the results in condensed matter literatures. More importantly, the phase transition at the critical impurity strength (or the critical temperature) is of zeroth order.