Doping dependence of chiral superconductivity in near 45∘ twisted bilayer cuprates

Mathieu Bélanger; David Sénéchal

doi:10.1103/PhysRevB.109.045111

← Back to search

Doping dependence of chiral superconductivity in near 45∘ twisted bilayer cuprates

Mathieu Bélanger, David Sénéchal

DOI 10.1103/PhysRevB.109.045111 · Physical Review B

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

We study a one-band Hubbard model for a twisted cuprate bilayer with a twist angle of 43.6∘ and a moiré 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∘ twist angle does not expand this TRS region compared to a previous study [Lu and Sénéchal, Phys. Rev. B 105, 245127 (2022)] on a 53∘ twist angle. This is attributed to the fact that the two superconducting states in competition have almost identical nodal structures.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown