Doping dependence of chiral superconductivity in near $45^{\circ }$ twisted bilayer cuprates

Abstract

We study a one-band Hubbard model for a twisted cuprate bilayer with a twist angle of 43.6${}^{\circ }$ and a moire cell containing 58 sites. We use the variational cluster approximation (VCA), which treats short-range correlations exactly and leads, in single layers, to a dome of d-wave superconductivity away from half-filling from strong on-site repulsion alone. We find a time-reversal-symmetry (TRS) breaking phase in a small doping interval in the overdoped region when interlayer tunneling is strong enough. Contrary to expectations, being closer to the $45^{\circ }$ twist angle does not expand this TRS region compared to a previous study [Phys. Rev. B 105, 245127 (2022)] on a $53^{\circ }$ twist angle. This is attributed to the fact that the two superconducting states in competition have almost identical nodal structures.

7 pages

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Cited by in corpus (4)

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