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arXiv · 2104.01485

High Temperature Superconductivity in a Lightly Doped Quantum Spin Liquid

Hong-Chen Jiang·Steven A. Kivelson
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Abstract

We have performed density-matrix renormalization group studies of a square lattice $t$-$J$ model with small hole doping, $δ\ll 1$, 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 ($δ=0$) "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, $χ\sim T^{-(2-K_{sc})}$ 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.

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Hong-Chen Jiang, Steven A. Kivelson. 2021-04-03. High Temperature Superconductivity in a Lightly Doped Quantum Spin Liquid. https://doi.org/10.1103/physrevlett.127.097002

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