Probing the bond order wave phase transitions of the ionic Hubbard model by superlattice modulation spectroscopy

Abstract

An exotic phase, the bond order wave, characterized by the spontaneous dimerization of the hopping, has been predicted to exist sandwiched between the band and Mott insulators in systems described by the ionic Hubbard model. Despite growing theoretical evidences, this phase still evades experimental detection. Given the recent realization of the ionic Hubbard model in ultracold atomic gases, we propose here to detect the bond order wave using superlattice modulation spectroscopy. We demonstrate, with the help of time-dependent density-matrix renormalization group and bosonization, that this spectroscopic approach reveals characteristics of both the Ising and Kosterlitz-Thouless transitions signaling the presence of the bond order wave phase. This scheme also provides insights into the excitation spectra of both the band and Mott insulators.

arXiv comment4 pages + references, 3 figures

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• Breakdown of topological Thouless pumping in the strongly interacting regime
• Splitting of topological charge pumping in an interacting two-component fermionic Rice-Mele Hubbard model
• Interaction-resistant metals in multicomponent Fermi systems
• Quantum phases and topological properties of interacting fermions in one-dimensional superlattices
• Interaction-driven topological phase transitions in fermionic SU($3$) systems
• Stabilization of Hubbard-Thouless pumps through nonlocal fermionic repulsion
• Magnetization, d-wave superconductivity and non-Fermi liquid behavior in a crossover from dispersive to flat bands
• Multi-frequency optical lattice for dynamic lattice-geometry control
• Competing Charge and Magnetic Order in Fermionic Multi-Component Systems
• Effective triangular ladders with staggered flux from spin-orbit coupling in 1D optical lattices
• Level statistics of the one-dimensional ionic Hubbard model
• Antiferromagnetic Chern insulator in centrosymmetric systems
• Intermediate Phase in Interacting Dirac Fermions with Staggered Potential
• Self-Energy Dispersion in the Hubbard Model
• Doping-dependent metal-insulator transition in a disordered Hubbard model
• Ground state phases and quantum criticalities of one-dimensional Peierls model with spin-dependent sign-alternating potentials
• Generalization of Lieb-Wu wave function inspired by one-dimensional ionic Hubbard model
• Accessing finite momentum excitations of the one-dimensional Bose-Hubbard model using superlattice modulation spectroscopy
• From explicit to spontaneous charge order and the fate of antiferromagnetic quantum Hall state
• Vortex supersolid in the XY model with tunable vortex fugacity
• Orbital antiferromagnetic currents in a frustrated fermionic ladder