Recent experimental progress has brought about better, defect-free infinite-layer nickelates [1] and the first finite-layer nickelate superconductor [2]. The measured superconducting dome is in exceedingly good agreement with our theoretical prediction [3] based on single Ni-$d_{x^2-y^2}$-band Hubbard model plus a decoupled electron reservoir for the pockets around the $A$ momentum and at low...
The different low energy effective Hamiltonians for cuprate high-Tc superconductors [1] can be considered as steps in a Wilsonian renormalization procedure from large- to small energy windows around the Fermi level. High energy models include bare interactions and all spin-, orbital-, and lattice degrees of freedom explicitly. However, at low energies many researchers consider the single band...
The recent discovery of AV$_3$Sb$_5$ (A=K,Rb,Cs) has uncovered an intriguing arena for exotic Fermi surface instabilities in kagome metals. Aside from charge density wave order, a multi-dome superconducting phase is found, with strong indications to be of unconventional origin including features such as time reversal symmetry breaking. We find that the sublattice interference mechanism is...
I will present recent numerically exact finite-temperature results for the two-dimensional Hubbard model obtained by diagrammatic Monte Carlo. I will show that there are several correlation regimes characterized by different magnetic correlation lengths and interaction strengths. I will discuss the connection between these regimes and the onset of a pseudogap. Finally, I will try to shake...