论文标题
二维相玻璃模型中疾病诱导的超导体向绝缘体过渡和有限相位刚度
Disorder-induced superconductor to insulator transition and finite phase stiffness in two-dimensional phase-glass models
论文作者
论文摘要
我们从数值上研究具有不同程度的疾病程度的二维相玻璃（或手性玻璃）模型中的绝缘体转变。这些模型描述了由于随机负约翰逊结耦合或$π$连接而导致的量规障碍在超导体中的影响。考虑了两个不同的模型，具有二元和高斯分布的淬火疾病分布，其平均值非为零。路径综合表示中的蒙特卡洛模拟用于确定相图和关键指数。除了通常的超导和绝缘阶段外，手性玻璃相对于足够大的疾病而发生，具有不同的手力局部局部循环电流。从超导体到绝缘体的过渡可以通过中间性手性玻璃相进行。但是，我们发现手性玻璃状态具有有限的相位刚度，仍然是超导体，而不是玻色金属，这是由平均场理论提出的。
We study numerically the superconductor to insulator transition in two-dimensional phase-glass (or chiral-glass) models with varying degree of disorder. These models describe the effects of gauge disorder in superconductors due to random negative Josephson-junction couplings, or $π$ junctions. Two different models are considered, with binary and Gaussian distribution of quenched disorder, having nonzero mean. Monte Carlo simulations in the path-integral representation are used to determine the phase diagram and critical exponents. In addition to the usual superconducting and insulating phases, a chiral-glass phase occurs for sufficiently large disorder, with random local circulating currents of different chiralities. A transition from superconductor to insulator can take place via the intermediate chiral-glass phase. We find, however, that the chiral-glass state has a finite phase stiffness, being still a superconductor, instead of the Bose metal, which has been suggested by mean-field theory.
