Mott-insulator-to-superconductor transition in a two-dimensional superlattice

Abstract

We use quantum Monte Carlo and exact diagonalization calculations to study the Mott-insulator to superconductor quantum phase transition in a two-dimensional fermionic Hubbard model with attractive interactions in the presence of a superlattice potential. The model introduced offers unique possibilities to study such transitions in optical lattice experiments. We show that, in regimes with moderate to strong interactions, the transition belongs to the 3D-XY universality class. We also explore the character of the lowest energy charge excitations in the insulating and superconducting phases and show that they can be fermionic or bosonic depending on the parameters chosen.

7 pages, published version (typo correction in the title of the latest version)

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Cited by in corpus (12)

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• Superconductor-Insulator Transition and Fermi-Bose Crossovers
• Interplay of interactions, disorder and topology in the Haldane-Hubbard model
• Bilayer Hubbard model: Analysis based on the fermionic sign problem
• Non-Hermitian Haldane-Hubbard model: Effective description of one- and two-body dissipation
• Higher-order topological insulator in a modified Haldane-Hubbard model
• Disorder in interacting quasi-one-dimensional systems: flat and dispersive bands
• Charge excitations across a superconductor-insulator transition
• Interplay of disorder and interactions in the bilayer band-insulator : A determinant quantum Monte Carlo study
• A universal pairing gap measurement proposal by dynamical excitations in 2D doped attractive Fermi-Hubbard model with spin-orbit coupling
• Dynamical structure factor and a new method to measure the pairing gap in two-dimensional attractive Fermi-Hubbard model
• Novel dynamical excitations and roton-based measurement of Cooper-pair momentum in a two-dimensional Fulde-Ferrell-Larkin-Ovchinnikov superfluid on optical lattices