Work

Mott-insulating phases of the Bose-Hubbard model on quasi-one-dimensional ladder lattices

Year: 2026

Type: article

Abstract: We calculate the phase diagram of the Bose-Hubbard model on a half-filled ladder lattice including the effect of finite on-site interactions. This shows that the rung-Mott insulator (RMI) phase persists for finite interaction strength, and we calculate the RMI-superfluid phase boundary in the thermodynamic limit. We show that the phases can still be distinguished using the number and parity variances, which are observables accessible in a quantum-gas microscope. Phases analogous to the RMI were found to exist in other quasi-one-dimensional lattice structures, with the lattice connectivity modifying the phase boundaries. This shows that the presence of these phases is the result of states with one-dimensional structures being mapped onto higher-dimensional systems, driven by the reduction of hopping rates along different directions.

Source: Physical Review A

DOI: 10.1103/wml6-1kc2

Authors: Lorenzo Carfora, Callum W. Duncan, Stefan Kuhr, Peter Kirton

Institution: University of Strathclyde

Language: English

Topic: Cold Atom Physics and Bose-Einstein Condensates

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $2,675

Funder: Engineering and Physical Sciences Research Council