Quantum fluctuations in thin superconducting wires of finite length

Details Quantum fluctuations in thin superconducting wires of finite length Quantum fluctuations in thin superconducting wires of finite length

2003-06-24

arxiv.org/abs/cond-mat/0306617v1

Phys. Rev. Lett. 92, 067007 (2004)

Physics

Condensed Matter

Superconductivity

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.92.067007

In one dimensional wires, fluctuations destroy superconducting long-range order and stiffness at finite temperatures; in an infinite wire, quasi-long range order and stiffness survive at zero temperature if the wire's dimensionless admittance $\mu$ is large, $\mu > 2$. We analyze the disappearance of this superconductor-insulator quantum phase transition in a finite wire and its resurrection due to the wire's coupling to its environment characterized through the dimensionless conductance $K$. Integrating over phase slips, we determine the flow of couplings and establish the $\mu$--$K$ phase diagram.

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