Superconductor/Insulator Transition in the Striped Phase

Details Superconductor/Insulator Transition in the Striped Phase Superconductor/Insulator Transition in the Striped Phase

1998-05-04

arxiv.org/abs/cond-mat/9805027v1

Physics

Condensed Matter

4 pages, RevTeX, 2 EPS-figures

Scientific paper

We study the transversal dynamics of a charged stripe (quantum string) at $T = 0$ and show that its kink excitations play the role of current carriers. If the hopping amplitude $t$ is much smaller than the string tension $J$, the string is pinned and its ground state (GS) is insulating. At $t \gg J$, the string is depinned and the GS is a kink-condensate. By mapping the system onto a Josephson junction chain, we show that this state is superconducting. At $(t/J)_c = 2 / \pi^2 $ the kink/antikink pairs decouple and a Kosterlitz-Thouless like insulator-superconductor transition occurs.

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