Repulsion driven metallic phase in the ground state of the half-filled $t-t^{\prime }$ ionic Hubbard chain

Abstract

An unusual metallic phase is proven to develop in the one dimensional ionic Hubbard model, at half-filling and zero magnetization, at intermediate electron-electron repulsion $U$ when second neighbors hopping is allowed and tuned close to a topological Lifshitz transition (connected with a change of the Fermi surface in the non-interacting system). The metallic state lies between a band insulator phase at low repulsion and a correlated (Mott-like) insulator phase at high repulsion. In approaching the later, the metal supports spontaneous bond charge dimerization and antiferromagnetic correlations. The ground state of the system, attainable by cold atoms in optical lattices for a wide range of the parameter $U$, is extensively explored by numerically exact density-matrix renormalization-group (DMRG) calculations. A combination of mean field and effective field theory (bosonization) provides an analytical understanding of the physical processes underlying the observed phase transitions.

arXiv comment18 pages, 16 figures, accepted in Phys.Rev. A

References in corpus (41)

• Feshbach Resonances in Ultracold Gases
• Bosonization and Strongly Correlated Systems
• A Mott insulator of fermionic atoms in an optical lattice
• Creating, moving and merging Dirac points with a Fermi gas in a tunable honeycomb lattice
• Fermi-Hubbard physics with atoms in an optical lattice
• Ultracold Atoms in a Tunable Optical Kagome Lattice
• Orbital superfluidity in the $P$-band of a bipartite optical square lattice
• Ultracold quantum gases in triangular optical lattices
• From band insulator to Mott insulator in one dimension
• Artificial graphene with tunable interactions
• Topological Lifshitz transitions
• Quantum critical behavior of the one-dimensional ionic Hubbard model
• Dielectric catastrophe at the Mott transition
• Unconventional superfluid order in the $F$-band of a bipartite optical square lattice
• Quantisation and its breakdown in a Hubbard-Thouless pump
• Ground-state phase diagram of the one-dimensional half-filled extended Hubbard model
• Topological Creutz Ladder in a Resonantly Shaken 1D Optical Lattice
• Semi-synthetic zigzag optical lattice for ultracold bosons
• Nature of the insulating phases in the half-filled ionic Hubbard model
• Exploring competing density order in the ionic Hubbard model with ultracold fermions
• Phase diagram of the Hubbard chain with two atoms per cell
• Ferromagnetism in Hubbard Models: Low Density Route
• Topological degeneracy and pairing in a one-dimensional gas of spinless Fermions
• Superconductivity from doping a spin liquid insulator: a simple one-dimensional example
• Realization of a cross-linked chiral ladder with neutral fermions in an optical lattice by orbital-momentum coupling
• Phase diagram of the half-filled Hubbard chain with next-nearest-neighbor hopping
• Optically-Controlled Orbitronics on a Triangular Lattice
• Splitting of topological charge pumping in an interacting two-component fermionic Rice-Mele Hubbard model
• Critical properties of the band-insulator-to-Mott-insulator transition in the strong-coupling limit of the ionic Hubbard model
• Interaction-resistant metals in multicomponent Fermi systems
• Bose-Hubbard triangular ladder in an artificial gauge field
• Numerical study of a superconductor-insulator transition in a half-filled Hubbard chain with distant transfers
• Phase diagram of the one-dimensional Hubbard model with next-nearest-neighbor hopping
• Band-Insulator-Metal-Mott-Insulator transition in the half--filled $t-t^{\prime }$ ionic-Hubbard chain
• Phase diagram of the $t-t^{\prime }-U$ chain at half filling
• Topological Lifshitz Transitions, Orbital Currents, and Interactions in Low-dimensional Fermi Gases in Synthetic Gauge Fields
• Spectrum, Lifshitz transitions and orbital currents in frustrated fermionic ladders with a uniform flux
• Two-fluid coexistence and phase separation in a one dimensional model with pair hopping and density interactions
• Effective Hamiltonian for a Half-filled Asymmetric Ionic Hubbard Chain with Alternating On-site Interaction
• Susceptibility at the edge points of magnetization plateau of 1D electron/spin systems
• Bosonization study of a generalized statistics model with four Fermi points

Cited by in corpus (1)

• Orbital antiferromagnetic currents in a frustrated fermionic ladder