寻找c轴无序模糊的超流-正常相变中难以捉摸的滑动相
Finding the elusive sliding phase in superfluid-normal phase transition smeared by c-axis disorder
摘要：
我们考虑一个系统的弱约瑟夫森耦合的超流层堆叠的c轴无序的形式随机超流刚度和涡逸度在每一层以及随机层间耦合强度。在没有无序的情况下，该系统具有作为温度的函数的3D XY型超流-正常相变。我们开发了一个功能重整化群来处理无序的影响，并表明，通过形成一个格里菲斯相的超流正常相变的混乱的结果涂抹。值得注意的是，在格里菲思阶段，层间耦合的幂律分布产生了滑动格里菲思超流体，具有各向异性临界电流，并且沿着层的a-b方向具有有限的刚度，垂直于它的刚度消失。
英文摘要：
We consider a system composed of a stack of weakly Josephson coupled superfluid layers with c-axis disorder in the form of random superfluid stiffnesses and vortex fugacities in each layer as well as random inter-layer coupling strengths. In the absence of disorder this system has a 3D XY type superfluid-normal phase transition as a function of temperature. We develop a functional renormalization group to treat the effects of disorder, and demonstrate that the disorder results in the smearing of the superfluid normal phase transition via the formation of a Griffiths phase. Remarkably, in the Griffiths phase, the emergent power-law distribution of the inter-layer couplings gives rise to sliding Griffiths superfluid, with an anisotropic critical current, and with a finite stiffness in a-b direction along the layers, and a vanishing stiffness perpendicular to it.
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