High Temperature Superconductivity in a Lightly Doped Quantum Spin Liquid.
Phys Rev Lett
; 127(9): 097002, 2021 Aug 27.
Article
em En
| MEDLINE
| ID: mdl-34506188
ABSTRACT
We have performed density-matrix renormalization group studies of a square lattice t-J model with small hole doping, δâª1, on long four and six-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 six-leg cylinder in the absence of frustration, we find power-law SC correlations with a Luttinger exponent, K_{SC}≈1, consistent with a strongly diverging SC susceptibility, χâ¼T^{-(2-K_{SC})} as the temperature Tâ0. 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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MEDLINE
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En
Ano de publicação:
2021
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Article