2017/05/08 by Ulrike Bornheimer, Ivana Vasić, Walter Hofstetter
Physics and Astronomy · #Amplitude #Bose–Hubbard model #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Hamiltonian (control theory) #Hubbard model #Ising model #Mott insulator #Mott transition #Optical lattice #Phase transition #Physics #Quantum mechanics #Quantum phase transition #Quantum tunnelling #Quantum, superfluid, helium dynamics #Square lattice #Strong Light-Matter Interactions #Superconductivity #Superfluidity #cond-mat.quant-gas
paper · pdf · doi:10.1103/physreva.96.063623
published as Phys. Rev. A 96, 063623 (2017)
arxiv created 2017/05/08 · openalex publication_date 2017/12/28 · arxiv updated 2018/01/03 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We investigate properties of an ultracold, two-component bosonic gas in a square optical lattice at unit filling. In addition to density-density interactions, the atoms are subject to coherent light-matter interactions that couple different internal states. We examine the influence of this coherent coupling on the system and its quantum phases by using Gutzwiller mean-field theory as well as bosonic dynamical mean-field theory. We find that the interplay of strong interspecies repulsion and coherent coupling affects the Mott insulator to superfluid transition and shifts the tip of the Mott lobe toward higher values of the tunneling amplitude. In the strongly interacting Mott regime, the resulting Bose-Hubbard model can be mapped onto an effective spin Hamiltonian that offers additional insights into the observed phenomena.