Superconductivity in a Quasi One Dimensional Spin Liquid
M. Sigrist, T.M. Rice, F.C. Zhang
TL;DR
This paper investigates how doping a quasi-one-dimensional spin liquid in a ladder model leads to superconductivity with a modified d-wave order parameter, suggesting potential superconducting phases in coupled ladder systems.
Contribution
It introduces a mean field approach with Gutzwiller renormalization to analyze the transition from a spin liquid to a superconductor in a ladder model.
Findings
Spin liquid state evolves into a superconductor upon doping.
The superconducting order parameter has a modified d-wave symmetry.
Weakly coupled ladders can exhibit a superconducting phase transition.
Abstract
The single rung t-J ladder is analyzed in a mean field theory using Gutzwiller renormalization of the matrix elements to account for strong correlation. The spin liquid (RVB) state at half-filling evolves into a superconducting state upon doping. The order parameter has a modified d-wave character. A lattice of weakly coupled ladders should show a superconducting phase transition.
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