Flux-density wave and superconducting instability of the staggered-flux phase
Ziqiang Wang, Gabriel Kotliar, Xiao-Fang Wang
DOI 10.1103/PhysRevB.42.8690 · Physical Review B
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Abstract
We study the stability of the staggered-flux phase in the t-J model away from half-filling using a systematic large-N slave-boson approach. Found below a critical doping concentration δc=a(J/t)2, is a flux-density-wave instability with an incommensurability wave number ∼δ3/4. The instability towards a modulated-flux state is due to low-lying phase fluctuations of the valence bonds. When the doping parameter exceeds δc, we find a fully gapped d-wave superconducting state due to residual quasiparticle interactions.
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