论文标题
磁场如何将超导体转化为玻色金属
How magnetic field can transform a superconductor into a Bose metal
论文作者
论文摘要
我们讨论一旦磁场抑制了一旦磁场的相干隧道抑制，磁场的相干隧道训练后，约瑟夫森隧道结合的超导带的简单理论是否可以描述金属转运。对于一个干净的系统，我们得出的结论是负面的：预成式对的激发光谱由Landau级别组成，一旦磁场超过临界值，传输就会变得绝缘。作为一个猜测，我们建议只要疾病足够强，可以将玻色金属存在于无序系统中。然后，繁殖和局部对之间的耦合扩大了Landau的水平，从而导致金属电导率。我们的模型尊重粒子孔对称性，这导致零霍尔响应。有趣的是，所得的异常金属状态没有drude峰，在低温下，回旋子共振的光谱重量消失。
We discuss whether a simple theory of superconducting stripes coupled by Josephson tunneling can describe a metallic transport, once the coherent tunneling of pairs is suppressed by the magnetic field. For a clean system, the conclusion we reached is negative: the excitation spectrum of preformed pairs consists of Landau levels, and once the magnetic field exceeds a critical value, the transport becomes insulating. As a speculation, we suggest that a Bose metal can exist in disordered systems provided that the disorder is strong enough to localize some pairs. Then the coupling between propagating and localized pairs broadens the Landau levels, resulting in a metallic conductivity. Our model respects the particle-hole symmetry, which leads to a zero Hall response. And intriguingly, the resulting anomalous metallic state has no Drude peak and the spectral weight of the cyclotron resonance vanishes at low temperatures.
