High Temperature Superconductivity in a Lightly Doped Quantum Spin Liquid

Abstract

We have performed density-matrix renormalization group studies of a square lattice $t$-$J$ model with small hole doping, $\delta \ll 1$, on long 4 and 6 leg cylinders. We include frustration in the form of a second-neighbor exchange coupling, $J_2=J_1/2$, such that the undoped ($\delta =0$) "parent" state is a quantum spin liquid. In contrast to the relatively short range superconducting (SC) correlations that have been observed in recent studies of the 6-leg cylinder in the absence of frustration, we find power law SC correlations with a Luttinger exponent, $K_{sc}\approx 1$, consistent with a strongly diverging SC susceptibility, $\chi \sim T^{-(2-K_{sc})}$ as the temperature $T\to 0$. The spin-spin correlations - as in the undoped state - fall exponentially suggesting that the SC "pairing" correlations evolve smoothly from the insulating parent state.

arXiv comment6 pages, 5 figures plus appendix

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