paper

High Temperature Superconductivity in a Lightly Doped Quantum Spin Liquid

arXiv:2104.01485 · doi:10.1103/PhysRevLett.127.097002

Abstract

We have performed density-matrix renormalization group studies of a square lattice - model with small hole doping, , on long 4 and 6 leg cylinders. We include frustration in the form of a second-neighbor exchange coupling, , such that the undoped () "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, , consistent with a strongly diverging SC susceptibility, as the temperature . The spin-spin correlations - as in the undoped state - fall exponentially suggesting that the SC "pairing" correlations evolve smoothly from the insulating parent state.

6 pages, 5 figures plus appendix

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