Analysis and resolution of the ground-state degeneracy of the two-component Bose-Hubbard model

Wei Wang, Vittorio Penna, Barbara Capogrosso-Sansone

We study the degeneracy of the ground-state energy $E$ of the two-component Bose-Hubbard model and of the perturbative correction $E_1$. We show that the degeneracy properties of $…