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Mass-imbalanced ionic Hubbard chain

Sekania, Michael ; Baeriswyl, Dionys ; Jibuti, Luka ; Japaridze, George I.

In: Physical Review B, 2017, vol. 96, no. 3, p. 035116

A repulsive Hubbard model with both spin-asymmetric hopping (t↑≠t↓) and a staggered potential (of strength Δ) is studied in one dimension. The model is a compound of the mass-imbalanced (t↑≠t↓,Δ=0) and ionic (t↑=t↓,Δ>0) Hubbard models, and may be realized by cold atoms in engineered optical lattices. We use mostly mean-field theory to determine the phases and phase transitions...