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.

4 pages + references, 3 figures

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• Stabilization of Hubbard-Thouless pumps through nonlocal fermionic repulsion
• Multi-frequency optical lattice for dynamic lattice-geometry control
• 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
• Doping-dependent metal-insulator transition in a disordered Hubbard model
• Vortex supersolid in the XY model with tunable vortex fugacity
• From explicit to spontaneous charge order and the fate of antiferromagnetic quantum Hall state
• Orbital antiferromagnetic currents in a frustrated fermionic ladder