Finding the elusive sliding phase in superfluid-normal phase transition smeared by c-axis disorder

Details Finding the elusive sliding phase in superfluid-normal phase transition smeared by c-axis disorder Finding the elusive sliding phase in superfluid-normal phase transition smeared by c-axis disorder

2010-03-24

arxiv.org/abs/1003.4723v1

Phys. Rev. Lett. 105, 085302 (2010)

Physics

Condensed Matter

Quantum Gases

4+epsilon pages, 4 figures

Scientific paper

10.1103/PhysRevLett.105.085302

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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