The Hubbard model is the simplest model of interacting fermions on a lattice and is of similar
importance to correlated electron physics as the Ising model is to statistical mechanics or the …

Reliable simulations of correlated quantum systems, including high-temperature
superconductors and frustrated magnets, are increasingly desired nowadays to further our …

The ground state and transport properties of the Lieb lattice flat band in the presence of an
attractive Hubbard interaction are considered. It is shown that the superfluid weight can be …

The Hubbard model of attractively interacting fermions provides a paradigmatic setting for
fermion pairing. It features a crossover between Bose-Einstein condensation of tightly bound …

Using determinantal quantum Monte Carlo, we compute the properties of a lattice model
with spin 1 2 itinerant electrons tuned through a quantum phase transition to an Ising …

The interplay of strong interactions and magnetic fields gives rise to unusual forms of
superconductivity and magnetism in quantum many-body systems. Here, we present an …

The cluster size dependence of superconductivity in the conventional two-dimensional
Hubbard model, commonly believed to describe high-temperature superconductors, is …

The Ising nematic quantum critical point associated with the zero-temperature transition from
a symmetric to a nematic metal is an exemplar of metallic quantum criticality. We carry out a …

Abstract The attractive Fermi–Hubbard model is the simplest theoretical model for studying
pairing and superconductivity of fermions on a lattice. It exhibits many interesting features …

We present a simple trick that allows us to consider the sum of all connected Feynman
diagrams at fixed position of interaction vertices for general fermionic models, such that the …