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Journal Articles Physical Review Letters Year : 2017

Probing the Bond Order Wave Phase Transitions of the Ionic Hubbard Model by Superlattice Modulation Spectroscopy

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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 evidence, 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.

Dates and versions

ensl-01659088 , version 1 (08-12-2017)

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Karla Loida, Jean-Sebastien Bernier, Roberta Citro, Edmond Orignac, Corinna Kollath. Probing the Bond Order Wave Phase Transitions of the Ionic Hubbard Model by Superlattice Modulation Spectroscopy. Physical Review Letters, 2017, 119 (23), pp.230403. ⟨10.1103/PhysRevLett.119.230403⟩. ⟨ensl-01659088⟩
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