Short-distance breakdown of the Higgs mechanism and the robustness of the BCS theory for charged superconductors
Short-distance breakdown of the Higgs mechanism and the robustness of the BCS theory for charged superconductors
复制标题
希格斯机制的短距离击穿和带电超导体 BCS 理论的鲁棒性
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
J. Schmalian
中科院分区：
文献类型：
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作者：
Sonja Fischer;Matthias Hecker;M. Hoyer;J. Schmalian
通过希格斯机制，长程库仑相互作用消除了超导体中的低能戈德斯通相模，并将光谱权重一直转移到等离子体频率。在这里，我们表明，希格斯机制打破了长度尺度短于超导相干长度。这种效应是超导希格斯场的复合性质的结果。最重要的是，超导相干体积内的希格斯机制的崩溃是至关重要的，以确保BCS平均场理论在弱耦合极限的稳定性。我们还表明，变化的差距方程由于等离子体激元诱导的波动可以导致显着的修正平均场理论，并揭示了超导体的密度波动谱的变化不仅限于附近的差距。
Through the Higgs mechanism, the long-range Coulomb interaction eliminates the low-energy Goldstone phase mode in superconductors and transfers spectral weight all the way up to the plasma frequency. Here we show that the Higgs mechanism breaks down for length scales shorter than the superconducting coherence length. This effect is a consequence of the composite nature of the Higgs field of superconductivity. Most importantly, the breakdown of the Higgs mechanism inside the superconducting coherence volume is crucial to ensure the stability of the BCS mean-field theory in the weak-coupling limit. We also show that changes in the gap equation due to plasmon-induced fluctuations can lead to significant corrections to the mean-field theory and reveal that changes in the density-fluctuation spectrum of a superconductor are not limited to the vicinity of the gap.
影响因子：
3.7
作者：
T. Cea;D. Bucheli;G. Seibold;L. Benfatto;J. Lorenzana;C. Castellani
通讯作者：
T. Cea;D. Bucheli;G. Seibold;L. Benfatto;J. Lorenzana;C. Castellani